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 particular gene, 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 particular gene, 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

In a monohybrid cross, what is the expected phenotypic ratio of offspring from two heterozygous parents?

Back

The expected phenotypic ratio is 3:1, where 3 offspring show the dominant trait and 1 shows the recessive trait.

Front

If gray fur (G) is dominant to white fur (g), what fraction of offspring from a Gg x Gg cross will have gray fur?

Back

3/4 of the offspring will have gray fur.

Front

If long stems (L) are dominant to short stems (l), what will be the genotype ratio from a cross between a heterozygous (Ll) and a homozygous dominant (LL) plant?

Back

The genotype ratio will be 1:1 (1 LL : 1 Ll).