Dihybrid Crosses

Front

What is the genetic makeup of an organism called?

Back

Genotype

Front

What is the term for the physical expression of traits in an organism?

Back

Phenotype

Front

In a dihybrid cross, how many traits are being examined?

Back

Two traits are crossed.

Front

What does it mean if an organism is homozygous?

Back

It has two identical alleles for a trait.

Front

What is the term for an organism that has two different alleles for a trait?

Back

Heterozygous

Front

What is the expected phenotypic ratio in a typical dihybrid cross?

Back

9:3:3:1

Front

What is the purpose of a Punnett square in genetics?

Back

To predict the genotypes and phenotypes of offspring from genetic crosses.

Front

What does the term 'F1 generation' refer to?

Back

The first generation of offspring from a cross.

Front

What does the term 'F2 generation' refer to?

Back

The second generation of offspring, produced by crossing F1 individuals.

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles express their trait even in the presence of a recessive allele, while recessive alleles only express their trait when homozygous.