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Biology, 05.05.2020 19:06 zeesharpe05
Trekian Fur is a dominant trait. Trekkies (on the planet Gomaz) from a pure-breeding population with the Trekian Fur gene are scored for their phenotypes. The two alleles at the Trekian Fur gene are T (dominant) and t (recessive).
80% of the Trekkies from this colony (genotype TT) have Trekian Fur; 20% of the Trekkies look wild-type.
Also, the penetrance of the Trekian Fur phenotype is 65% in the heterozygous Trekkies.
Pure breeding wild-type Trekkies (tt) show the Trekian Fur phenotype 10% of the time. Thus, the penetrance of Trekian Fur is 10% in homozygous wild-type Trekkies.
Problem: If two heterozygotes for the Trekian Fur gene (Tt x Tt) are crossed, what proportion of the offspring are expected to show the Trekian Fur phenotype?
A. 80%.
B. 55%.
C. 45%.
D. 50%.
E. 20%.
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Trekian Fur is a dominant trait. Trekkies (on the planet Gomaz) from a pure-breeding population with...
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