Question

For each phenotype, give all the genotypes that are possible.

A tall head (T) is dominant to a round head (t).
Tall = ₋₋₋₋₋₋₋₋₋₋₋₋₋₋ .
Round = ₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋ .
Brown hair (B) is dominant to red (b) hair.
Red = ₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋ .
Brown = ₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋₋ .
a) Tall: TT, Round: Bb; Red: bb
b) Tall: Tt; Round: TT, Tt, tt; Brown: Bb, bb
c) Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb
d) Tall: TT, Tt; Round: tt; Red: Bb

Answer 1

The tall phenotype in pea plants is represented by genotypes TT and Tt, while the round head phenotype is represented solely by tt. For hair color, the brown phenotype is represented by BB and Bb, and the red phenotype is represented by bb. So, the correct answer is c) Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb.

Step-by-step explanation:

Genotypes Possible for Each Phenotype

The genotypes that can result in a tall phenotype for pea plants include both homozygous dominant (TT) and heterozygous (Tt) genotypes.

This is because the dominant allele for tallness (T) masks the presence of the recessive allele (t).

As a result, both TT and Tt plants will exhibit a tall phenotype. Conversely, the only genotype that results in the round head phenotype (which is the recessive trait) is homozygous recessive (tt).

When it comes to hair color, brown hair (B) being dominant to red (b) hair, the genotypes that produce a brown hair phenotype can be either homozygous dominant (BB) or heterozygous (Bb).

On the other hand, the red hair phenotype will only be seen in the homozygous recessive genotype (bb).

It’s important to remember that a phenotype can be produced by more than one genotype when dominance is involved.

So, the correct answer is c) Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb.

Answer 2

A tall head (T) is dominant to a round head (t).The possible genotypes is Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb.Thus the option c) Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb is correct.

Step-by-step explanation:

In the given scenario, the inheritance of traits follows Mendelian principles. For the tall head phenotype, represented by T, the possible genotypes are Tt and tt. The round head phenotype, represented by t, can have genotypes BB, Bb, or bb. Finally, for the brown hair phenotype, represented by B, the genotypes include BB and Bb. The provided answer, c), correctly accounts for these possibilities, ensuring a combination of alleles that leads to the observed phenotypes.

Each phenotype is determined by the combination of alleles inherited from each parent. In option c), the tall phenotype can result from inheriting either Tt or tt, the round phenotype from BB, Bb, or bb, and the brown hair phenotype from BB or Bb. This combination aligns with the rules of dominance and inheritance.

Understanding genetic inheritance involves recognizing how dominant and recessive alleles interact to produce specific phenotypes. In this case, the correct answer comprehensively considers the possible combinations of alleles for each phenotype, adhering to the principles of Mendelian genetics. It provides a clear and accurate representation of the genetic outcomes based on the given dominance relationships.

Thus the option c) Tall: Tt, tt; Round: BB, Bb, bb; Brown: BB, Bb is correct.