In an attempt to simplify meiosis for the benefit of stu-dents, mad scientists develop a way of preventing premei-otic S phase and making do with having just one division, including pairing, crossing over, and segregation. Would this system work, and would the products of such a sys-tem differ from those of the present system?

In an attempt to simplify meiosis for the benefit of stu-dents, mad scientists develop a way of preventing premei-otic S phase and making do with having just one division, including pairing, crossing over, and segregation. Would this system work, and would the products of such a sys-tem differ from those of the present system?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations

Section: Chapter Questions

Problem 19QP: The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the...

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It is possible that an alternative mechanism for generating germ cells could have evolved. Consider meiosis in a germ cell precursor (a cell that is diploid but will go on to make gametes). If the S phase were skipped, which meiotic division (meiosis I or meiosis II) would no longer be required?
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?
Figure 13.6 Which of the following statements about nondisjunction is true? Nondisjunction only results in gametes with n+1 or n-1 chromosomes. Nondisjunction occurring during meiosis II results in 50 percent normal gametes. Nondisjunction during meiosis I results in 50 percent normal gametes. Nondisjunction always results in four different kinds of gametes.
Compare meiotic anaphase I with meiotic anaphase II. Which meiotic anaphase is most similar to the mitotic anaphase?
Explain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis.
The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the duration of meiosis in females, speculate on the possible reasons for females contributing aneuploid gametes more frequently than males do.
In an attempt to simplify meiosis for the benefit of students, mad scientists develop a way of preventing premeiotic S phase and making do with having just one division,including pairing, crossing over, and segregation. Wouldthis system work, and would the products of such a system differ from those of the present system?
A disomic product of meiosis is obtained. What is itslikely origin? What other genotypes would you expectamong the products of that meiosis under yourhypothesis?
in the experiment of following chromosomal dna mvement througgh meiosis, why. do you use non-sister chromatids to demobstrate crossing over? what combinatiobns of alleles could result from a crossover between BD and bd chromosomes? Identify two ways that meiosis contributes to genetic recombination. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cell?
Let’s suppose a pea plant is heterozygous for three genes, Tt Yy Rr, and each gene is on a different chromosome. How many different wayscould the three pairs of homologous chromosomes line up during metaphase of meiosis I?
in the expermient of following chromosomal dna movement through meiosis, how many chromosomes were present when meiosis I started? How many nuclei are present at the end of meiosis ll? How many chromosomes are in each? What is the ploidy of the DNA at the end of meiosis l? What about at the end of meiosis ll? How are meiosis l and meiosis ll different? List two reason
A person is born with one X chromosome, zero Y chromosomes,trisomy 21, and two copies of the other chromosomes. How manychromosomes does this person have altogether? Explain whetherthis person is euploid or aneuploid.