Which part of meiosis is responsible for new combinations of alleles on different types of chromosomes in a gamete? You Answered crossing over during prophase I and metaphase I the checkpoints that stop the meiotic cell cycle if there are errors.or the wrong conditions Correct Answer the independence of the alignment of the tetrads during metaphase

Which part of meiosis is responsible for new combinations of alleles on different types of chromosomes in a gamete? You Answered crossing over during prophase I and metaphase I the checkpoints that stop the meiotic cell cycle if there are errors.or the wrong conditions Correct Answer the independence of the alignment of the tetrads during metaphase

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Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter3: Transmission Of Genes From Generation To Generation

Section: Chapter Questions

Problem 23QP: Meiosis Explains Mendels Results: Genes Are on Chromosomes Discuss the pertinent features of meiosis...

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Explain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis.
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Meiosis Explains Mendels Results: Genes Are on Chromosomes The following diagram shows a hypothetical diploid cell. The recessive allele for albinism is represented by a, and d represents the recessive allele for deafness. The normal alleles for these conditions are represented by A and D, respectively. a. According to the principle of segregation, what is segregating in this cell? b. According to Mendels principle of independent assortment, what is independently assorting in this cell? c. How many chromatids are in this cell? d. Write the genotype of the individual from whom this cell was taken. e. What is the phenotype of this individual? f. What stage of cell division is represented by this cell (prophase, metaphase, anaphase, or telophase of meiosis I, meiosis II, or mitosis)? g. After meiosis is complete, how many chromatids and chromosomes will be present in one of the four progeny cells?
Meiosis Explains Mendels Results: Genes Are on Chromosomes Discuss the pertinent features of meiosis that provide a physical correlate to Mendels abstract genetic laws of random segregation and independent assortment.
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Choose the best matching phrase in the right columnfor each of the terms in the left column.a. meiosis 1. X and Yb. gametes 2. chromosomes that do not differbetween the sexesc. karyotype 3. one of the two identical halvesof a replicated chromosomed. mitosis 4. microtubule organizing centersat the spindle polese. interphase 5. cells in the testes that undergomeiosisf. syncytium 6. division of the cytoplasmg. synapsis 7. haploid germ cells that uniteat fertilizationh. sex chromosomes 8. an animal cell containing morethan one nucleusi. cytokinesis 9. pairing of homologouschromosomesj. anaphase 10. one diploid cell gives rise to twodiploid cellsk. chromatid 11. the array of chromosomes in agiven celll. autosomes 12. the part of the cell cycle duringwhich the chromosomes are notvisiblem. centromere 13. one diploid cell gives rise to fourhaploid cellsn. centrosomes 14. cell produced by meiosis thatdoes not become a gameteo. polar body 15. the time during mitosis whensister chromatids…
Which meiotic division(s) reduce(s) chromosome number (i.e., meiosis I, meiosis II, or both)? Explain your answer.
Assuming that such a fly would be viable, what would be the sexof a fruit fly with the following chromosomal composition?A. One X chromosome and two sets of autosomesB. Two X chromosomes, one Y chromosome, and two sets ofautosomesC. Two X chromosomes and four sets of autosomesD. Four X chromosomes, two Y chromosomes, and four sets ofautosomes
Cells at the end of meiosis (i.e. each of the four gametes) have _____ when compared with cells at thebeginning of meiosis (i.e. the parent cell in prophase I).a. half the number of chromosomes and one-fourth the amount of DNAb. half the number of chromosomes and half the amount of DNAc. the same number of chromosomes and half the amount of DNAd. half the amount of cytoplasm and half the amount of DNA
f chromosomal nondisjunction occurs during meiosis I, what proportionof zygotes formed from the resulting gametes would be aneuploid? (Assume the gametes from the otherparent are normal) a. 0% b. 25% c. 50% d. 75% e. 100%
A disomic product of meiosis is obtained. What is itslikely origin? What other genotypes would you expectamong the products of that meiosis under yourhypothesis?