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 an allele to be dominant?

Back

A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

Front

What does it mean for an allele to be recessive?

Back

A recessive allele is one that only expresses its trait when two copies are present in the genotype.

Front

What is the genotype of a heterozygous individual?

Back

A heterozygous individual has two different alleles for a particular gene, represented as 'Aa'.

Front

What is the genotype of a homozygous dominant individual?

Back

A homozygous dominant individual has two identical dominant alleles for a trait, represented as 'AA'.

Front

What is the genotype of a homozygous recessive individual?

Back

A homozygous recessive individual has two identical recessive alleles for a trait, represented as 'aa'.

Front

What is a Punnett square?

Back

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

Front

How do you determine the phenotypic ratio from a Punnett square?

Back

The phenotypic ratio is determined by counting the number of offspring with each phenotype and expressing it in simplest form.

Front

In a monohybrid cross of two heterozygous parents (Gg x Gg), what fraction of the offspring will be homozygous recessive?

Back

1/4 of the offspring will be homozygous recessive (gg).

Front

In a monohybrid cross, what is the expected phenotypic ratio for dominant to recessive traits?

Back

The expected phenotypic ratio is 3:1 for dominant to recessive traits.