In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heterozygous plant (Tt) is crossed with a homozygous tall plant?
A. 100%<~~~ I think it's A
B. 75%
c. 50%
D. 25%
All the gametes from homozygous tall plants would be T and then from heterozygous plant would be T and t. If you make a punnett square then you will see that 100% of progeny is tall due to Tt genotype (50%) and TT genotype (50%) since T is dominant to t.
Which is correct ? A ? if not which one ?
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Use same name.
You are right.
No it is D
The correct answer is B. 75%.
When a heterozygous plant (Tt) is crossed with a homozygous tall plant (TT), the possible genotypes of the offspring would be 50% TT and 50% Tt. Both of these genotypes result in the phenotype of tall plants because the allele for tall (T) is dominant to the allele for short (t). Therefore, 75% (50% TT + 25% Tt) of the offspring will be tall. Option A, 100%, is incorrect because not all of the offspring will be tall.
The correct answer is B. 75%.
To determine the percent of offspring that will be tall in this cross, we need to consider the allele combinations that can result from the parents.
The homozygous tall plant has the genotype TT, meaning it can only produce gametes with the T allele.
The heterozygous plant has the genotype Tt, meaning it can produce gametes with both the T and t alleles.
When we cross these plants, we can make a Punnett square:
T T
T TT TT
t Tt Tt
From the Punnett square, we can see that there are two possible genotypes for the offspring: TT and Tt. Both of these genotypes result in a tall phenotype because the T allele is dominant to the t allele.
Therefore, 75% of the offspring will be tall (TT genotype) and 25% will be short (Tt genotype).
So the correct answer is B. 75%.