AP Biology Unit 5 Heredity

Front

What is complete dominance in genetics?

Back

Complete dominance occurs when the phenotype of the heterozygote is the same as that of the homozygous dominant individual.

Front

What is the probability of obtaining a red, axial offspring from a cross between a white, terminal flower and a red, axial flower?

Back

9/16

Front

Define incomplete dominance.

Back

Incomplete dominance is a form of inheritance where the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.

Front

In a cross between two roan cows (codominant), what is the probability of a white cow?

Back

1/4

Front

What is the expected phenotype ratio in a monohybrid cross?

Back

The expected phenotype ratio in a monohybrid cross is typically 3:1 for dominant to recessive traits.

Front

In an incomplete dominance cross between a white flower and a red flower, what is the probability of a pink offspring?

Back

100%.

Front

What is the expected number of homozygous dominant offspring in a cross between a homozygous dominant and a homozygous recessive parent in a population of 100?

Back

0.

Front

What is the difference between homozygous and heterozygous?

Back

Homozygous refers to having two identical alleles for a trait, while heterozygous refers to having two different alleles for a trait.

Front

What does it mean if a trait is recessive?

Back

A recessive trait is one that is only expressed in the phenotype when two copies of the recessive allele are present.