Monohybrid and Dihybrid Crosses

Front

What is a monohybrid cross?

Back

A genetic cross between individuals that differ in one trait, typically involving one pair of contrasting traits.

Front

What is a dihybrid cross?

Back

A genetic cross between individuals that differ in two traits, typically involving two pairs of contrasting traits.

Front

What is the phenotypic ratio for a monohybrid cross?

Back

The typical phenotypic ratio is 3:1.

Front

Define heterozygous.

Back

An organism that has two different alleles for a particular gene (e.g., Bb).

Front

What is the phenotypic ratio for a dihybrid cross?

Back

The typical phenotypic ratio is 9:3:3:1.

Front

What does homozygous mean?

Back

An organism that has two identical alleles for a particular gene (e.g., BB or bb).

Front

What is the Law of Segregation?

Back

The principle that during the formation of gametes, the two alleles for a trait separate from each other.

Front

What is the Law of Independent Assortment?

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The principle that alleles for different traits are passed independently of one another from parents to offspring.

Front

What are genotypes?

Back

The genetic makeup of an organism, represented by the alleles it possesses (e.g., TT, Tt, tt).

Front

What is a phenotype?

Back

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