Question

assuming tallness is dominant, what would the genotype look like for a man who is homozygous for tall? what are the possible gamete combinations?

Answer 1

If tallness is a dominant trait, and a man is homozygous for tallness, then his genotype would be represented by two dominant alleles. Let's use "T" to represent the dominant allele for tallness.

The genotype of a man who is homozygous for tall would be:

TT

Now, when this individual produces gametes (sperm cells), each gamete will carry one allele. Since he is homozygous, all his gametes will carry the dominant allele "T."

The possible gamete combinations would be:

T

T

So, regardless of which sperm he contributes, each will carry the dominant allele for tallness.

Answer 2

A man who is homozygous for the tall trait would have the genotype TT, and his possible gamete combinations would all be T, leading to his offspring all carrying at least one allele for tallness, assuming he reproduces with a partner who carries at least one T allele.

Step-by-step explanation:

If we assume that tallness is a dominant trait in pea plants, represented by the allele 'T', then a man who is homozygous for tall would have the genotype TT. Since he is homozygous, all of his gametes would carry the tall allele, 'T'. Thus, the possible gamete combinations for this homozygous individual would simply be 'T' from each gamete during reproduction.

An example using Mendel's pea plants can illustrate this point well. A pea plant with a homozygous dominant genotype for tallness (TT) will show the tall phenotype. Conversely, a pea plant with a heterozygous genotype (Tt) will also exhibit the tall phenotype, since the presence of the dominant 'T' allele masks the effect of the recessive 't' allele. Therefore, two different genotypes can result in the same phenotype.