The father of Mr. Spock, first officer of the Starship Enterprise, came from the

Question

The father of Mr. Spock, first officer of the Starship Enterprise, came from the planet Vulcan; Spock's mother came from Earth. A Vulcan has pointed ears( determined by allele P), adrenals absent(determined by A), and a right-sided heart(determined by R). All these alleles are dominant to Earth alleles. The three loci are autosomal, and they are linked as shown in the linkage map below. Interference is I = 0.4

P----15 m.u-----A------20 m.u------R

If Mr. Spock marries an Earth woman, what proportion of their children will have

b. Earth phenotypes for all three characters?

Explanation / Answer

The father of Mr. Spock, first officer of the Starship Enterprise, came from the planet Vulcan; Spock's mother came from Earth. A Vulcan has pointed ears( determined by allele P), adrenals absent(determined by A), and a right-sided heart(determined by R). All these alleles are dominant to Earth alleles. The three loci are autosomal, and they are linked as shown in the linkage map below. Interference is I = 0.4

P----15 m.u-----A------20 m.u------R

If Mr. Spock marries an Earth woman, what proportion of their children will have

d. Vulcan ears but Earth heart and adrenals?

P A R / p ar X    p a r / p a r

P a R / p a r------ (0.15 X 0.20) / 2 = 0.015


p A r / p a r---------- (0.15 X 0.20) / 2 = 0.015


P a r / p a r-------- (0.15 - 0.03) / 2 = 0.06


p A R / p a r -------- (0.15 - 0.03) / 2 = 0.06


P A r / p a r----- ( 0.20 - 0.03) / 2 = 0.085


p a R / p a r----------- (0.20 - 0.03) / 2 = 0.085


P A R / p a r------- (1 - 0.32) / 2 = 0.34


p a r / p a r ------------(1 - 0.32) / 2 0.34



c. Vulcan ears and heart but Earth adrenals?


answer 0.015

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