If Mr. Spock fathers a child with an Earthling female, what are the chances that the child will have pointed ears and adrenal glands? Select one: a. 50% b. 10% c. 25% d. 20%
All Vulcans have pointed ears (P) and a right-sided heart (R) which are dominant over Earthling alleles of rounded ears (p) and a left-sided heart (r). Both Vulcans and Earthlings are homozygous for each allele.
Mr. Spock has a Vulcan father and an Earthling mother.
Gametes produced by an individual that are the same as the gametes contributed by each parent to produce that individual are called parental types.
Gametes that have a combination of parental and maternal alleles are called recombinant types.
Recombinant gametes are the result of independent assortment during Metaphase I if genes are on different chromosomes or crossing over during prophase I if genes are on the same chromosome.
The genes for ear shape (P/p) and heart sidedness (R/r) are 20 map units apart on chromosome 7. The gene for adrenal glands (A/a) is on chromosome 3.
If Mr. Spock fathers a child with an Earthling female, what are the chances that the child will have pointed ears and adrenal glands?
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