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.
What is the answer please ?
Use same name when you post.
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 are Tt and TT.
The Tt genotype results in a tall phenotype, because the T allele is dominant over the t allele.
The TT genotype also results in a tall phenotype, as it is homozygous dominant.
Therefore, out of the possible genotypes of the offspring, 75% will be tall (either Tt or TT), and 25% will be short (tt).
The correct answer is B. 75%.
To understand why, let's break down the process:
- A heterozygous plant (Tt) has one dominant allele for tallness (T) and one recessive allele for shortness (t).
- A homozygous tall plant (TT) has two dominant alleles for tallness (T).
When the heterozygous plant (Tt) is crossed with the homozygous tall plant (TT), the potential gametes from each parent are as follows:
- Tt plant: Can produce two types of gametes, one with the dominant allele (T) and one with the recessive allele (t).
- TT plant: Can only produce gametes with the dominant allele (T).
To determine the percent of offspring that will be tall, we can use a Punnett square:
T T
T | TT | TT
t | Tt | Tt
From the Punnett square, we can see that there are four possible combinations for the offspring: TT, TT, Tt, and Tt.
- TT: This genotype represents homozygous tall plants, which means they will be tall.
- Tt: This genotype represents heterozygous tall plants, which means they will also be tall.
Out of the four possible combinations, three (TT, TT, and Tt) out of the four result in tall plants.
Therefore, the percent of offspring that will be tall is 3/4, which is equal to 75%, making the correct answer B.