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.

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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 a Carrier in genetics?

Back

An individual who has one copy of a recessive allele that causes a genetic disease in individuals who are homozygous for that allele.

Front

What is the genotype of a parent with one dominant and one recessive allele for a trait?

Back

The genotype is heterozygous, represented as Tt.

Front

What is the probability of offspring having a recessive trait if both parents are carriers?

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25% chance of having offspring with the recessive trait.

Front

What does the notation X^H and X^h represent?

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X^H represents the X chromosome with the normal blood clotting allele, while X^h represents the X chromosome with the hemophilia allele.

Front

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

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The expected phenotype ratio is 9:3:3:1.

Front

What is the significance of the Punnett square in genetics?

Back

A tool used to predict the genotypes and phenotypes of offspring from a genetic cross.

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What does homozygous mean?

Back

An organism with two identical alleles for a specific trait, such as RR or rr.

Front

What does heterozygous mean?

Back

An organism with two different alleles for a specific trait, such as Rr.