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20 October, 06:28

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%.

+1
Answers (1)
  1. 20 October, 06:53
    0
    B. 55%.

    Explanation:

    TT = 80percent progeny that exhibit Trekian fur phenotype

    Tt = 65% progeny exhibit Trekian fur phenotype

    tt = 10% progrny exhibit Trekian fur phenotye

    parent cross; TT x Tt

    progeny; TT Tt tt

    TT = 25%; percentage of progeny that exhibit Trekian fur phenotype = 25 x 0.8 = 20%

    Tt = 50%; percentage of progeny that exhibit Trekian fur phenotype = 50 x 0.65 = 32.5%

    tt = 25%; percentage of progeny that exhibit Trekian fur phenotype = 25 x 0.1 = 2.5%

    Total = 20 + 32.5 + 2.5 = 55%
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Home » Biology » 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).
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