Wednesday (02/05) -Dihybrids Re-Quiz - 2025

Blond hair and long nose are are both considered dominant human traits. What are the expected phenotypes of the offspring of a female with blond hair and long nose (BbLl) and a male with blond hair and short nose (BBll)?

In humans, being tall (T) is dominant to being short (t), and having wavy hair (W) is dominant to having straight hair (w). Two parents are that are heterozygous for both traits mate.

What is the probability that an offspring will short and have wavy hair?

In the 1860s Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid crosses involve inheritance related to two different traits. In pigs the allele for black fur is dominant to brown, and the allele for short fur is dominant over long fur. What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for BOTH traits?

In birds, feather color and claw size may each be determined by one gene. The allele for white feathers color is dominant to black feather color and long claws are dominant to short claws.

A bird with the genotype WwLl has what combination of alleles in its gametes? Select all that apply.

A genetic cross involving two unlinked genes is represented.

GGBb x GgBb

Which genotype is NOT possible in the offspring produced by the cross?

Pea color and texture are inherited traits in pea plants. Yellow peas (Y) are dominant to green peas (y) and smooth texture (S) is dominant to rough texture (s). The alleles for green peas and rough texture are recessive.

If a pea plant which is homozygous dominant for yellow and homozygous recessive for rough texture is crossed with another plant which is heterozygous for yellow peas and heterozygous for smooth texture, what would be the genotype of an offspring with yellow peas and rough texture?

Marmots have two unlined allele pairs that affect fur color. The table shows how allele pairs affect fur color. Marmots with the gg allele pair are black, regardless of their second allele-pair combination.

What is the probability of albinism in the offspring of a cross between two mice with MmGg alleles?