Dihybrid Cross Practice

Front

What is a dihybrid cross?

Back

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

Front

What does the term 'homozygous' mean?

Back

An organism with two identical alleles for a trait (e.g., BB or bb).

Front

What does the term 'heterozygous' mean?

Back

An organism with two different alleles for a trait (e.g., Bb).

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the phenotypic ratio in a typical dihybrid cross?

Back

9:3:3:1, representing the ratio of different phenotypes in the offspring.

Front

What is the genotypic ratio in a typical dihybrid cross?

Back

1:2:1:2:4:2:1:2:1, representing the ratio of different genotypes in the offspring.

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals.

Front

How do you determine the gametes from a genotype like TtDd?

Back

By combining each allele from each gene: TD, Td, tD, td.

Front

What is the expected fraction of offspring with a specific trait in a dihybrid cross?

Back

It can be calculated using the ratios from the Punnett square.

Front

What does 'BBEE x bbee' represent in a genetic cross?

Back

A cross between a homozygous dominant for both traits and a homozygous recessive for both traits.