Punnett Squares - Monohybrid Crosses

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

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

How are alleles represented in genetic notation?

Back

Dominant alleles are represented by uppercase letters, while recessive alleles are represented by lowercase letters.

Front

What is the genotype of a homozygous dominant individual?

Back

The genotype of a homozygous dominant individual consists of two identical dominant alleles (e.g., AA).

Front

What is the genotype of a heterozygous individual?

Back

The genotype of a heterozygous individual consists of one dominant allele and one recessive allele (e.g., Aa).

Front

If a homozygous dominant plant (AA) is crossed with a homozygous recessive plant (aa), what are the genotypes of the offspring?

Back

All offspring will be heterozygous (Aa).

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous individuals (Aa x Aa)?

Back

The expected phenotypic ratio is 3:1, with three showing the dominant trait and one showing the recessive trait.

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

In a genetic cross, what does the term 'phenotype' refer to?

Back

Phenotype refers to the observable characteristics or traits of an organism, determined by its genotype.