Dihybrid Crosses

Front

What is a dihybrid cross?

Back

A dihybrid cross is a genetic cross that examines the inheritance of two different traits, each controlled by different genes.

Front

What does the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles for a trait (e.g., BB or bb), while heterozygous genotypes have two different alleles (e.g., Bb).

Front

What is the expected phenotypic ratio in a dihybrid cross?

Back

The expected phenotypic ratio in a dihybrid cross is 9:3:3:1.

Front

What does it mean for an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

How do you determine the probability of a specific genotype in a dihybrid cross?

Back

To determine the probability of a specific genotype, count the number of times that genotype appears in the Punnett square and divide by the total number of possible genotypes.

Front

What are alleles?

Back

Alleles are different versions of a gene that can exist at a specific locus on a chromosome.