For an individual with the XXXY chromosomal composition, the expected number of

Question

For an individual with the XXXY chromosomal composition, the expected number of Barr bodies in interphase cells is _____. variable one two three zero Inactivation of X chromosome is random in the embryotic stem cell in the early development stage; later, all descendant cells have some inactivation. This is the reason how Calico cats show black and yellow-orange patches of fur color due to activation of different fur color genes in different areas of cells. How do you call the hypothesis for this phenomenon? Null hypothesis Alternate hypothesis Lyon hypothesis Mendel hypothesis Lion hypothesis Which cross below can identify X-linked genes? Testcrosses Reciprocal crosses Monohybrid crosses hybrid crosses Which statement below is incorrect? Linked genes are certain genes which segregate as if part of same chromosome and are inherited as single unit. Synapsed chromosomes reciprocally exchange segments-reshuffle (recombine) alleles between homologs. The frequency of crossing over between two genes is proportional to the distance between them. Genes show linkage if on different chromosome Genes assort independently if on different chromosomes. Which statement below is incorrect? Percentage of spring resulting from recombinant gametes depends on distance between two genes on chromosome. Linked genes exist in a linear order along the chromosome and variable amount of exchange occurs between any two genes during gamete formation. Two genes located relatively close to each other along chromosome are less likely to have chiasma formed between them, and less likely to have crossover occurred. Complete linkage produces parental or noncrossover gametes in equal proportions When Two linked genes with loci far apart, number of recombinants can exceed 50%

Explanation / Answer

(23) number of barbodies for a given karyotype = total number of X chromosome-1

in th given karyotype(XXXY), total number of X chromosome=3; number of bar boddies=3-1=2 (Answer C)

(24) Answer C Lyon Hypothesis states that random inactivation of paternal X chromosome and maternal chromosome occurs in somatic cells during early embryonic development which results in mosaic ndividuals

(25) Answer B Reciprocal Cross is used to study role of prental sex on inheritance pattern.

(26) Answer D genes shows linkage when are close to each other on same chromosome.

(27) Answer E recombination frequency never exceeds 50%

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