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 Ban 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. There is Klinefelter syndrome in which one extra X chromosome found and it will have single barr body. Barr body can be assumed using the number of X chromosomes more than one. In case of XXXY karyotype will have two Barr bodies. These barr bodies can be seen on the nucleus of neutrophils .C option is correct.

24. Option C is correct. As per Lyon hypothesis the X chromosome of mammalian cell at early stage of embryogenesis gets inactivated. The choice of X chromosome inactivation is random. It will remain inactive for life time.

25. Option B is correct. Reciprocal cross used to test the role of parental sex for determine the inheritance. In Offspring the male trait are expressing and in other one the female trait are expressing. It will be based on the sex linked gene transfer.

26. Option D is correct because Gene linkage can be observed only when they are present on same chromosome. If genes are present on different chromosome .they assort independently, which will known as unlinked.

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