How are the plant height genotypes TT and Tt similar?
Answers:
A) Both are examples of heterozygous genotypes.
B) Both are examples of homozygous genotypes.
C) Both are expressed as a short phenotype.
D) Both are expressed as a tall phenotype.
B) Both are examples of homozygous genotypes.
The correct answer is B) Both are examples of homozygous genotypes.
To determine how the plant height genotypes TT and Tt are similar, we need to understand the concepts of homozygous and heterozygous genotypes, as well as their phenotypic expressions.
A homozygous genotype refers to when an individual has two identical alleles for a particular trait. In this case, TT would represent a homozygous genotype, with two copies of the dominant allele T for plant height.
On the other hand, a heterozygous genotype refers to when an individual has two different alleles for a particular trait. Tt would represent a heterozygous genotype because it contains one copy of the dominant allele T and one copy of the recessive allele t for plant height.
Comparing the genotypes TT and Tt, we observe that both contain at least one copy of the dominant allele T, which determines a tall plant height. Therefore, options C) and D) can be eliminated as they imply the expression of a short phenotype.
Now, since the genotypes TT and Tt differ in terms of homozygosity and heterozygosity, we can eliminate option B), which suggests that they are examples of homozygous genotypes.
This leaves us with option A), which states that both TT and Tt are examples of heterozygous genotypes. This is correct because the heterozygous genotype Tt contains two different alleles (T and t) for the plant height trait, while the homozygous genotype TT contains two identical alleles (T).
So, the correct answer is A) Both are examples of heterozygous genotypes.