Punnett Square Practice

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 do the letters 'A' and 'a' represent in genetics?

Back

In genetics, 'A' typically represents a dominant allele (e.g., Brown hair), while 'a' represents a recessive allele (e.g., Blond hair).

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, specifically the alleles present for a particular gene.

Front

What is the ratio of phenotypes in a monohybrid cross?

Back

In a monohybrid cross, the typical phenotype ratio is 3:1 for dominant to recessive traits.

Front

What is the purpose of a Punnett Square?

Back

The purpose of a Punnett Square is to visualize and calculate the probability of offspring inheriting particular traits from their parents.

Front

If T=tall and t=short, what is the genotype for a short plant?

Back

The genotype for a short plant is 'tt', as it must have two recessive alleles.

Front

What does it mean if an organism is homozygous?

Back

An organism is homozygous if it has two identical alleles for a particular gene (e.g., AA or aa).

Front

What does it mean if an organism is heterozygous?

Back

An organism is heterozygous if it has two different alleles for a particular gene (e.g., Aa).

Front

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

Back

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