7.3 Monohybrid Punnett Squares 2023

Front

What is a monohybrid cross?

Back

A monohybrid cross is a genetic cross between two individuals that differ in one trait, focusing on the inheritance of a single characteristic.

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 one that is only expressed in the phenotype when two copies of the allele are present.

Front

What is the genotype of an individual with gray fur (G) and white fur (g)?

Back

The genotype of an individual with gray fur can be either homozygous dominant (GG) or heterozygous (Gg).

Front

If two heterozygous gray-furred mammals (Gg) are mated, what is the expected phenotypic ratio of their offspring?

Back

The expected phenotypic ratio is 3 gray fur: 1 white fur.

Front

What is the expected genotype ratio from a cross between two heterozygous individuals (Gg x Gg)?

Back

The expected genotype ratio is 1 GG : 2 Gg : 1 gg.

Front

What is the probability of obtaining a child with genotype Ee from a cross between Ee and ee?

Back

The probability is 50%.

Front

What is the expected percentage of offspring with yellow peas when two yellow pea plants (gg) are crossed?

Back

100% of the offspring will have yellow peas.

Front

What is the expected percentage of offspring with small wings from a cross between a homozygous dominant (WW) and a homozygous recessive (ww) fly?

Back

0% of the offspring will have small wings.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross.