** Prior, which I forgot to include:

All Vulcans have pointed ears (P) and a right-sidedheart (R) which are dominant over Earthling alleles ofrounded ears (p) and a left-sided heart (r). BothVulcans 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 gametescontributed by each parent to produce that individual are calledparental types.

Gametes that have a combination of parental and maternal allelesare called recombinant types.

Recombinant gametes are the result of independent assortment duringMetaphase I if genes are on different chromosomes or crossing overduring prophase I if genes are on the same chromosome.

In which I got the following: PR, PP, pR,Pr

_______

In Vulcans, the absence of adrenal glands (A) isdominant over the Earthling allele for adrenal glands (a). AllEarthlings have adrenal glands.

A gene map of Mr. Spock shows that the genes for ear shape(P/p) and heart sidedness (R/r) are 20 map unitsapart on chromosome 7 while the gene for adrenal glands(A/a) is on chromosome 3.

If Mr. Spock fathers a child with an Earthling female, what is thechance that the child will have pointed ears and adrenalglands?

Select one:

a. 10%

b. 20%

c. 25%

d. 50%

Can someone please show me how to get the proper answer? I keepgetting myself confused on this self-check question, and I don'tknow where I keep messing up.

Thank you