Monohybrid 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 does the term 'heterozygous' mean?

Back

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

Front

What does the term 'homozygous' mean?

Back

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

Front

What is a phenotype?

Back

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

Front

What is a genotype?

Back

The genetic constitution of an individual, represented by the alleles it possesses (e.g., BB, Bb, or bb).

Front

What is the principle of dominance?

Back

In a heterozygous genotype, the dominant allele masks the effect of the recessive allele.

Front

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

Back

B and b.

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous parents (Bb x Bb)?

Back

3:1 (3 dominant phenotype : 1 recessive phenotype).

Front

What is the expected genotypic ratio of a monohybrid cross between two heterozygous parents (Bb x Bb)?

Back

1:2:1 (1 BB : 2 Bb : 1 bb).

Front

What does it mean if an organism is described as 'dominant'?

Back

The allele that expresses its trait even in the presence of a recessive allele.