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Q9 Which of the following is incorrect when describing the barr body? A. Leads to mosaicism...

Q9 Which of the following is incorrect when describing the barr body? A. Leads to mosaicism of x linked genes in women B.Is a condensed x chromosome C.Accounts for blue eyes in women D.Occurs in females E.Occurs in order to correct gene dosage in women versus men

Q10. In a cross between a homozygous dominant parent and a homozygous recessive parent, what is the % chance of any homozygous recessive offspring?

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Answer #1

Q9.Ans.

C.Accounts for blue eyes in women

Explanation :

" The eye colour of human " is an example of polygenic inheritance, which can be controlled by more than one gene. Blue eyes in women is not concern with the Barr body. Except option C, others are concerned with the barr body.

Hence, the answer is option C.

Q10. Ans.

Here, genotypic ratio is 1:2:1.

Here we can see that the F2 generation have genotypes of (TT,Tt,Tt,tt ) and a genotypic ratio ( 1:2:1) i.e one forth of F2 generation would be homozygous dominant, one half would be heterozygous,and one forth would be homozygous recessive. Therefore, In a cross between a homozygous dominant parent and a homozygous recessive parent, the chance of any homozygous recessive offspring is 25% .

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