PLEASE SHOW ALL WORK, IM LOST. The father of Mr. Spock, first officer of the sta

Question

PLEASE SHOW ALL WORK, IM LOST. The father of Mr. Spock, first officer of the starship Enterprise, came from the planet Vulcan; his mother came from planet Earth. A Vulcan has pointed ears (+), adrenals absent (+), and a right-sided heart (+). All of these alleles are dominant over Earth alleles. These genes are autosomal, and they are linked as shown in the linkage map: (1.0pts)

+/P                    +/A                +/R

|                       |                      |

18 m.u.         16 m.u.

If Mr. Spock marries an Earth woman, what proportion of

their children:

A. Will show Vulcan appearance for all three characters?

B. Will show Earth appearance for all three characters?

C. Will have Vulcan ears and heart but Earth adrenals?

D. Will have Vulcan ears but Earth heart and adrenals?

Explanation / Answer

All alleles are dominant over Earth alleles. But the father is given to be heterozygous. The genotype of mother is P/P, A/A, and R/R (mother) crossed with +/P, +/A, +/R

vulcan appearance is parental type. Genes are linked. 18mu distance between +/P. So, 82% parental types will be there. 41% +/P and 41% P/P will be there.

Talking about recombinants:- 9% will be +/P and 9% will be P/P.

Similarly talking about adrenals, 42% + 8% = 50% will have +/A and the rest 50% will have A/A

Ans A..... 50% offsprings will show all three characters.

Ans B.... 50% will show earth appearance.

Ans C.... genotype asked is +/P +/R A/A= 1/8

Ans D.... +/P A/A R/R = 1/8

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