Practice: Monohybrid Crosses

Front

What is a monohybrid cross?

Back

A genetic cross between two individuals that differ in a single trait, where both parents are heterozygous for that trait.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that is expressed in the phenotype even when only one copy of the allele is present.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is only expressed in the phenotype when two copies of the allele are present.

Front

What is the genotype of a plant that is homozygous for green color?

Back

GG (two dominant alleles).

Front

What is the genotype of a plant that is heterozygous for green color?

Back

Gg (one dominant allele and one recessive allele).

Front

What is a phenotype?

Back

The physical expression or characteristics of a genetic trait.

Front

What is a genotype?

Back

The genetic makeup of an individual, represented by the alleles they possess.

Front

If a green plant (Gg) is crossed with a yellow plant (gg), what are the possible genotypes of the offspring?

Back

50% Gg (green), 50% gg (yellow).

Front

What is the phenotypic ratio of a monohybrid cross between two heterozygous plants (Gg x Gg)?

Back

3:1 (3 green: 1 yellow).

Front

What is the purpose of a Punnett square?

Back

To predict the genotypes and phenotypes of offspring from a genetic cross.