Monohybrid Punnett Squares 2024

Front

What is a monohybrid cross?

Back

A monohybrid cross is a genetic cross between two individuals that differ in a single trait, where one trait is dominant and the other is recessive.

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

Front

What is a genotype?

Back

A genotype is the genetic makeup of an individual, represented by the alleles inherited from the parents.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is the purpose of a Punnett square?

Back

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

Front

How do you determine the fraction of offspring with a specific trait using a Punnett square?

Back

By filling out the Punnett square with the possible gametes from each parent and counting the occurrences of the desired trait.

Front

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

Back

The expected genotype ratio is 1:2:1 (1 AA : 2 Aa : 1 aa).

Front

What is the expected phenotype ratio from a cross between two heterozygous individuals (Aa x Aa) where A is dominant?

Back

The expected phenotype ratio is 3:1 (3 dominant : 1 recessive).

Front

If a homozygous dominant plant (LL) is crossed with a heterozygous plant (Ll), what are the possible genotypes of the offspring?

Back

The possible genotypes are 50% LL and 50% Ll.