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katen-ka-za [31]
3 years ago
12

Penetrance In a certain breed of plants, thorns are determined by the dominant allele T and thornless is determined by the reces

sive allele t. T is 60% penetrant in the heterozygote; 40% of heterozygotes will appear thornless. If you make the parental cross TT x tt; what would be the expected number of progeny for each phenotype in a population of 400 F2 plants?
Biology
1 answer:
Gelneren [198K]3 years ago
6 0

Answer:The Thorn plants will be about 300 while the thornless plants will be about 100.

Explanation:

When the parents cross

TT x tt

F1; Tt, Tt,Tt, Tt.

Tt x Tt

F2;. TT, Tt, Tt, tt..

Phenotypic ratio; 3:1.

Hence,3/4* 400=300

1/4*. 400=100

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