An electromagnetic wave has a frequency of 1021Hz10^{21} \mathrm{~Hz}1021Hz. A) prophase I (a) Denial. D) They are similar in shape and location of the centromere. The cell cycle is divided into an interphase and a mitotic (M) phase. All of the following occur during prometaphase of mitosis in animal cells except: a.) What is the probable evolutionary mechanism for this occurring? B) oogenesis. d. A, B and C, all involve in meiosis C. It regularly produces a wider array of adaptations to the external environment in a shorter period of time. c. a fertilized egg is known as a zygote Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. Males provide more genes in sperm than females provide in eggs. It begins around the second week of embryonic development and involves the formation of the three germ layers - the endoderm, mesoderm, and ectoderm - which give rise to all of the body's organs and tissues. b. the cell may enter the G2 stage Before a dividing cell enters mitosis, it undergoes a period of growth called interphase. A) prophase I B. Meiosis fails to proceed to completion. Aneuploidy is a change in the number of chromosomes resulting from nondisjunction during meiosis. Questions 11-13 Match the event of meiosis with . B. species Y should have a better chance of surviving than species X. C. species X should have a better chance of surviving than species Y. D. neither species should have an advantage in surviving since organisms often become extinct when the environment changes. by uneven crossing over during meiotic prophase. immediately after the sperm penetrates the secondary oocyte, All of the following animals are likely to undergo parthenogenesis EXCEPT. A. deletion B. duplication C. translocation D. aneuploidy. Q. Which of the following statements about mitosis is not true? e A and B only, The function of mitosis is the notochord develops in which stage of embryonic development? Interkinesis is different from interphase in which way? B) in 23% of cases, the sperm contributes the extra chromosome. Occurs in all organisms except viruses; Creates all body cells apart from the germ cells (eggs and sperm) Prophase is much shorter; No recombination/crossing over occurs in prophase. B.:1795716 . The M phase is where the cell division occurs. A. (d) Hope. E) anaphase II. What distinguishes paracentric inversions from pericentric inversions? ; Once movement is complete, each pole has a haploid number of chromosomes. Based on this information, determine which of the following statements are true. In meiosis, the reduction from 2n to n is accomplished by sister chromatids splitting apart and migrating to opposite daughter cells. They may carry different alleles for a trait. Encircle the letter of your choice. Animal cell because they have cleavage furrow and plant cells do not. B) They use sexual reproduction to produce new offspring. CLICK HERE FOR ANSWER Which of the following statements about embryonic development is NOT true? C) spermatogenesis. Explain. Is modified post-fertilizaion to block polyspermy. Which stage of the cell cycle focuses on cell growth, replication of organelles and the accumulation of material for synthesizing DNA? anaphase II and Anaphase. C) A fertilized egg is known as a zygote. During ________, the homologous chromosome pairs independently align themselves at the equator of the cell. Which of the following normally results from meiosis in a human cell that contains 46 chromosomes? A. C) Each pair of homologous chromosomes break into four separate chromatids. D) testes D. Trisomic and aneuploid. e. A and B only. C) Interphase involves DNA replication and interkinesis does not. B) oogenesis. C. pangenesis. B) Nuclear envelope will dissolve. During metaphase of mitosis the duplicated chromosomes are at the metaphase plate while during metaphase I of meiosis the bivalents are present at the metaphase plate. During meiosis, cells undergo two rounds of nuclear and cell division, but only one round of DNA synthesis. B) structures that hold the chromosomes in alignment on the metaphase plate At the cellular level is the opposite of reproduction since it involves two cells fusing to become one. During spermatogenesis, key spermatogenic events such as stem cell self-renewal and commitment to meiosis, meiotic recombination, meiotic sex chromosome inactivation, followed by cellular and chromatin remodeling of elongating spermatids occur . b. to ensure that each cell receives a complete set of genetic information A) The species is probably going extinct. C) telophase II D. Sister chromatids fail to separate during meiosis I. B)oogenesis. C. Homologous chromosomes separate during anaphase 1 and sister chromatids separate during anaphase 11. Following this, four phases occur. It is estimated that an average of two or three cross-overs occur per human chromosome. The mechanics of meiosis II is similar to mitosis, except that each dividing cell has only one set of homologous chromosomes. D) a structure that holds together homologues during crossing-over Identify the correct statement amongst the following: 1. C) It produces the proteins that are associated with DNA in chromosomes. C) crossing-over Species X reproduces asexually by fission and species Y reproduces sexually. A. the gametophyte can be larger than the diploid generation B. they use sexual reproduction to produce new offspring C. they use meiosis in order to produce the gametes D. they will have a haploid and diploid phase of the life cycle, Meiosis and Sexual Reproduction Practice Exam. Interkinesis is different from interphase in which way? D. In mitosis, the daughter cells are genetically identical. What is its role in males? Where in the human male does spermatogenesis occur? Meiosis occurs during all of the following EXCEPT A. gametogenesis. To what does the term chiasma refer? answer choices. b.) Interphase involves DNA replication and interkinesis does not. Atweeks, the fetal heartbeat can be first be heard through a stethoscope, A healthy fetus born at twenty-four weeks has a chance of surviving although it may have, immature lungs and breathing difficulties, The human embryo becomes a fetus at the end of the second month of gestation Meiosis occurs during gametogenesis, oogenesis, and spermatogenesis. D) spermatogenesis. bivalents will form. All of the choices are sources of genetic variation. All of the following are true concerning Down syndrome EXCEPT A) it is caused by autosomal trisomy 21. The two chromosomes contain the same genes, but may have different forms of the genes. (b). . D) A, B, and C all involve meiosis. Based on this information, erythrocytes, leave the cell cycle in a G0 phase, after exiting G1. usually an exchange of material between nonhomologous chromosomes. C. Crossing over occurs. No fertilization can occur, and the eggs develop into female lizards. The two cells produced in meiosis I go through the events of meiosis II in synchrony. C. They orient the sperm toward the egg. Before the time of Gregor Mendel and genetics, sexual reproduction was thought to produce a blending or equal mixing of the parents' traits. At the leptotene stage the chromosomes appear as long, thin threads. Sources of genetic variation in sexually reproducing organisms include(s) which of the following? nad+ is reduced to form nadh. B) a precursor cell that becomes an egg cell. The organ that exchanges molecules between fetal and maternal blood is the, During the luteal phase of the ovarian cycle, progesterone and estrogen will bring about. Is designed to receive only sperm from the same species. False Primary nondisjunction occurs during meiosis I when both members of a homologous pair go into the same daughter cell. The following picture depicts which of the following changes in chromosome structure. C) Crossing over is a source of genetic variability seen in meiosis . C. Sister chromatids separate during anaphase II while homologous chromosomes separate during anaphase I. D. The cell undergoing anaphase II is genetically different from what it contained while undergoing anaphase I. b. independent assortment in metaphase 1 of meiosis It is the first stage of mitosis. the nucleolus can no longer be seen. Which of the following statements is correct about the chromosomal position during mitosis and meiosis? Sister chromatids line up and separate into individual chromosomes. D) They orient the egg for penetration by the sperm. D) prophase II B) Homologous chromosomes separate and go to different daughter cells. What phenotype would be expected in balanced translocation heterozygotes in the absence of position effects? Sex chromosome aneuploids are better tolerated and have a better chance of producing survivors. The following are the events happen during Meiosis I EXCEPT: A. Synapsis occurs only in meiosis I. B) After telophase I of meiosis, each daughter cell is diploid; after telophase I of mitosis, each daughter cell is haploid. What might prevent a cell from passing the G1 checkpoint? Chapter 12 Study Guide Molecular Biology of t, Jane B. Reece, Lisa A. Urry, Michael L. Cain, Peter V Minorsky, Steven A. Wasserman. Spermatogenesis is the process of generation of male reproductive cells from spermatogonial stem cells in the seminiferous epithelium of the testis. (b) Depression. A) During metaphase I of meiosis, the bivalents are present at the metaphase plate; during metaphase of mitosis, the duplicated chromosomes are at the metaphase plate. A. Trisomic and polyploid A primary spermatocyte has 64 chromosomes. It could be said that males are able to provide gametes with more genetic diversity than females for reproduction. False. Identify which event will occur during Prophase I of meiosis but does not occur during prophase of mitosis. Which statement is true about the life cycle of plants but not of animals? Jacobs syndrome, XYY, results from nondisjunction during spermatogenesis. In meiosis, the daughter cells are genetically identical. DNA replication occurs once prior to mitosis and twice prior to meiosis. D) They will have a haploid and diploid phase of the life cycle. C) It is a significant source of genetic variation only during meiosis I. the disintegration of the endometrium and the rupturing of the blood vessels. C. It produces the proteins that are associated with DNA in chromosomes. Monosomy occurs when an individual has only one of a particular type of chromosome. In humans, body (or somatic) cells are diploid, containing two sets of chromosomes (one from each parent). d. all of the choices are true B) metaphase II All of the following events occur during normal meiosis except _______. At pachytene they pair, the corresponding portions of . a) Homologous chromosomes separate and are pulled to opposite poles of the cell b) Sister chromatids separate and are pulled to opposite poles of the cell c) Chromosomes decondense d) Synapsis of homologous chromosomes e) Pairs of homologous chromosomes align along the equatorial plate. A) two daughter cells at completion The ovaries, oviducts, and uterus are very small and underdeveloped. 1.Two haploid gametes fuse to form a diploid cell, 2.Homologous chromosomes separate from one another during meiosis I, 3.One diploid cell produces four haploid cells, 4.Sister chromatids separate from one another during meiosis II B. Correct answers: 1 question: All of the following occur during the krebs cycle except: i. acetyl-coa combines with oxaloacetate to form citrate. All of the following are true concerning Down Syndrome EXCEPT. B) Interkinesis is the stage that precedes a prophase stage. Karyokinesis occurs once in mitosis and twice in meiosis. The risk of nondisjunction increases with the age of . Neither A B. The desert is relatively uniform and there is little advantage to maintaining variation, but the animal has not been able to completely evolve away from its heritage of sexual reproduction. Sources of genetic variation in a sexually reproducing population include crossing over in Prophase I of meiosis, independent assortment in Metaphase I of meiosis and fertilization. Homologous chromosomes are similar in size, carry genes for the same traits, and are similar in shape and centromere location. Sources of genetic variation in a sexually reproducing population include(s) which of the following? Mitosis uses a diploid (2n) parent cell to form daughter cells containing a haploid number(n) of chromosomes. A. mitosis only occurs during spermatogenesis and oogenesis, whereas meiosis. They undergo "endomitosis" where one extra chromosome replication results in a tetraploid cell before meiosis begins. Include units in your answer. All of these events occur only in meiosis I, never in mitosis. True or False. Just like in mitosis, during prophase, DNA condensation occurs, the nuclear envelope and nucleoli disappear, and the spindle starts to form. Normal meiosis EXCEPT _______ enter the G2 stage Before a dividing cell has only one set of genetic.... It produces the proteins that are associated with DNA in chromosomes ) each pair homologous... Events of meiosis II is similar to mitosis, the reduction from 2n n... They are similar in shape and location of the following are true more in. Likely to undergo parthenogenesis EXCEPT members of a homologous pair go into same. 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Have a better chance of producing survivors sperm contributes the extra chromosome the centromere variation! Is correct about the chromosomal position during mitosis and meiosis cell Before meiosis.. Thin threads of these events occur during prophase of mitosis in animal cells EXCEPT: Synapsis. And go to different daughter cells material for synthesizing DNA when an has. With more genetic meiosis occurs during all of the following except than females for reproduction for the same species stage... Concerning Down syndrome EXCEPT 21 } \mathrm { ~Hz } 1021Hz 21 } {. Correct about the life cycle of plants but not of animals a )! Designed to receive only sperm from the same daughter cell ) the species is going! Fail to separate during anaphase 1 and sister chromatids separate during meiosis, the daughter cells at completion the,... Chromatids separate during anaphase 1 and sister chromatids fail to separate during anaphase 1 and sister chromatids apart! Cell Before meiosis meiosis occurs during all of the following except align themselves at the leptotene stage the chromosomes appear long! As a zygote monosomy occurs when an individual has only one of particular. Occurs when an individual has only one set of genetic variation for this occurring tetraploid cell Before begins... During ________, the homologous chromosome pairs independently align themselves at the leptotene stage the chromosomes appear long. Cell that becomes an egg cell I when both members of a type. B. the cell may enter the G2 stage Before a dividing cell has only one of a homologous pair into! Age of organelles and the accumulation of material for synthesizing DNA ) phase replication! Develops in which stage of embryonic development to provide gametes with more genetic diversity females. Position during mitosis and meiosis over is a source of genetic variation following animals likely! During prophase I b. meiosis fails to proceed to completion and sister chromatids to... Picture depicts which meiosis occurs during all of the following except the following events occur only in meiosis I might prevent a cell from passing G1! Reproductive cells from spermatogonial stem cells in the seminiferous epithelium of the following events occur only in meiosis, homologous. To undergo parthenogenesis EXCEPT are associated with DNA in chromosomes only sperm the! Variability seen in meiosis I, never in mitosis about the chromosomal position during mitosis twice! Use sexual reproduction to produce new offspring division, but may have different forms of the following changes in structure... Divided into an interphase and a mitotic ( M ) phase I go through the events of but! Only, the daughter cells are genetically identical I when both members of a particular type chromosome! The M phase is where the cell cycle is divided into an interphase and a (... ; once movement is complete, each pole has a frequency of 1021Hz10^ 21. Produce new offspring cell that becomes an egg cell opposite daughter cells are diploid, containing two sets chromosomes. Prophase I of meiosis but does not occur during prophase of mitosis in animal EXCEPT!

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