Dihybrid Cross Practice and Genetics Review

Front

What is Incomplete Dominance?

Back

A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two traits.

Front

What is Co-Dominance?

Back

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

What is the expected phenotype ratio when a roan cow and a roan steer mate?

Back

1: Orange: 2 Orange and White: 1 White.

Front

What is the probability that offspring from a cross X^H X^h and X^H Y will have hemophilia?

Back

1/4.

Front

What percentage of female offspring will be carriers for hemophilia from the same cross?

Back

50%.

Front

What does Heterozygous mean?

Back

The organism has two different genes for the same trait.

Front

What is a Dihybrid Cross?

Back

A genetic cross that involves two traits, each represented by two alleles.

Front

What is the phenotypic ratio expected from a dihybrid cross of two heterozygous parents (AaBb x AaBb)?

Back

9:3:3:1.

Front

Define the term 'Genotype'.

Back

The genetic constitution of an individual, represented by the alleles inherited from the parents.

Front

Define the term 'Phenotype'.

Back

The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.