Concepts of Genetics (11th Edition)
Concepts of Genetics (11th Edition)
11th Edition
ISBN: 9780321948915
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 9, Problem 5PDQ

In diploid yeast strains, sporulation and subsequent meiosis can produce haploid ascospores, which may fuse to reestablish diploid cells. When ascospores from a segregational petite strain fuse with those of a normal wild-type strain, the diploid zygotes are all normal. Following meiosis, ascospores are petite and normal. Is the segregational petite phenotype inherited as a dominant or a recessive trait?

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A heterozygous diploid yeast Aa Bb went through meiosis. What percentage of the haploid spores will have recombinant combinations of alleles? What if genes A and B are unlinked? Explain What is genes A and B are linked?  Explain
In the haploid yeast Saccharomyces cerevisiae, the twomating types are known as MATa and MATα. You cross apurple (ad-) strain of mating type a and a white (ad+)strain of mating type α. If ad- and ad+ are alleles of onegene, and a and α are alleles of an independently inherited gene on a separate chromosome pair, what progenydo you expect to obtain? In what proportions?
In a diploid organism, two homologous chromosomes synapse at prophase 1 of meiosis.  One of the homologous chromosomes carries a sequence of four genes named A, B, C, and D.  They get capital letters because each gene is dominant.  On the two chromatids of the homologous chromosome, the same sequence of genes are all recessive.  They are denoted a, b, c, and d.   During prophase I of meiosis, when the homologous chromosomes synapse with one another, there is a crossover between two of the non-sister chromatid.  These two chromatids break between genes B and C, as shown in the diagram below.  They then reattach to the non-sister chromatid. What will each of these  2 chromatids carry after they separate from their sister chromatid in meiosis 2?

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Concepts of Genetics (11th Edition)

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