( Problem Set: Exceptions to Mendelian Genetics ) In chimps, baldness is an auto

Question

(Problem Set: Exceptions to Mendelian Genetics) In chimps, baldness is an autosomal dominant sex-influenced trait. Males who have at least one baldness allele (b) show the trait, but females need at least two to show the trait. Another independently assorting autosomal allele produces a white chest (W) that is dominant over a black chest (w). Give the phenotypes and their expected proportions for the following cross: BbWw (male) x Bbww (female). You may use either a Punnett square or a branch diagram to show your work

Explanation / Answer

Gametes produced by BbWw male are BW, Bw, bW, bw

Gametes produced by Bbww female are Bw, bw

BBWw

male/female with hair,

white chest

BBww

male/female with hair,

black chest

BbWw

if male the child will be bald,

white chest

bbww

male/female both will be bald,

black chest

BbWw

if male then bald, if female, then with hair,

white chest

Bbww

bald male but if the child is female she will have hair,

black chest

BbWw

if male the child will be bald,

white chest

bbww

male/female both will be bald,

black chest

BW Bw bW bw Bw

BBWw

male/female with hair,

white chest

BBww

male/female with hair,

black chest

BbWw

if male the child will be bald,

white chest

bbww

male/female both will be bald,

black chest

bw

BbWw

if male then bald, if female, then with hair,

white chest

Bbww

bald male but if the child is female she will have hair,

black chest

BbWw

if male the child will be bald,

white chest

bbww

male/female both will be bald,

black chest

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