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 'genotype' refer to?

Back

The genetic makeup of an organism, represented by allele combinations (e.g., Aa, AAbb).

Front

What does the term 'phenotype' refer to?

Back

The observable characteristics or traits of an organism, determined by its genotype.

Front

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.

Front

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

Back

9:3:3:1.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous has two identical alleles (e.g., AA or aa), while heterozygous has two different alleles (e.g., Aa).

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in the phenotype.

Front

What is the genotype for a plant that is homozygous recessive for both traits in a dihybrid cross?

Back

aabb.

Front

If a plant has the genotype AaBb, what are the possible gametes it can produce?

Back

AB, Ab, aB, ab.

Front

What fraction of offspring will be homozygous recessive for both traits in a dihybrid cross of AaBb x AaBb?

Back

1/16.