Monohybrid, dihybrid, mutations

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 does the term 'homozygous' mean?

Back

An organism with two identical alleles for a particular trait (e.g., RR or rr).

Front

What does the term 'heterozygous' mean?

Back

An organism with two different alleles for a particular trait (e.g., Rr).

Front

What is the phenotype of a plant with genotype RrYy?

Back

The phenotype can be round and yellow seeds, as R (round) is dominant over r (wrinkled) and Y (yellow) is dominant over y (green).

Front

What is the genotype for a pea plant that is homozygous for round seeds and heterozygous for yellow seeds?

Back

RRYy.

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 expected phenotypic ratio in a dihybrid cross?

Back

9:3:3:1 ratio for the four possible phenotypes.

Front

What is a mutation?

Back

A change in the DNA sequence that can lead to changes in traits.

Front

What are dominant and recessive alleles?

Back

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