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EastWind [94]
4 years ago
13

Plant A and Plant B are heterozygous for a gene that expresses their tall trait (Tt). Upon crossing, what is expected in the off

spring, assuming random chromosome segregation?
Biology
1 answer:
Oksi-84 [34.3K]4 years ago
8 0
The answer is 75% of offspring will be tall and 25% of offspring will be short.

If:
T - the dominant allele for tall trait
t - the recessive allele for short trait

Then:
TT - dominant homozygote (tall)
Tt - heterozygote (tall)
tt - recessive homozygote (short).

In the cross of two heterozygotes Tt x Tt <span>75% of offspring will be tall and 25% of offspring will be short:

Parental generation:        Tt     x     Tt
Offspring generation:   TT    Tt    Tt    tt

Thus, 3 out of 4 (=3/4=75%) offspring are tall (1 TT and 2 Tt) and 1 out of 4 (=1/4=25%) offspring is short. Speaking of genotypes, 1 out of 4 (=1/4=25%) is dominant homozygote (TT), </span>2 out of 4 (=2/4=50%) is heterozygote (Tt), and <span>1 out of 4 (=1/4=25%) is recessive homozygote (tt).</span>
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