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 same 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? Test crosses Reciprocal crosses Monohybrid crosses Dihybrid 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 offspring 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. 2

24. Lyon hypothesis

Lyonization is also called as X in activation. The female has 2 X chromosomes. According to this one X chromosome is inactivated and it remains as hetero chromatin. The in activation remains the same throughout the life time.

25. Reciprocal cross

Reciprocal cross is done between a male of one strain with a female strain it is used to determine the sex linked pattern of inheritance in the progeny.

26. Option D.

Linked genes are always present on same chromosome.

27. Option A.

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