Monohybrid Crosses

Front

What is a monohybrid cross?

Back

A genetic cross between individuals that involves one pair of contrasting traits.

Front

Define genotype.

Back

The genetic makeup of an organism, represented by alleles (e.g., BB, Bb, bb).

Front

Define phenotype.

Back

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

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., BB or bb).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Bb).

Front

What is a Punnett square?

Back

A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between Bb and Bb?

Back

25% (1/4).

Front

What is the probability of obtaining a dominant phenotype from a cross between Bb and bb?

Back

50% (2/4).

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals.

Front

If a brown-eyed (Bb) and a blue-eyed (bb) parent have offspring, what is the probability of having a blue-eyed child?

Back

50% (2/4).