Punnett Squares

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 'B' and 'b' represent in genetics?

Back

'B' represents a dominant allele (e.g., brown fur), while 'b' represents a recessive allele (e.g., white fur).

Front

What is the probability of getting brown fur (B) from a Bb x Bb cross?

Back

50%.

Front

What is the genotype of two brown-eyed parents who have children with both brown and blue eyes?

Back

Bb x Bb.

Front

What does homozygous recessive mean?

Back

An organism is homozygous recessive if it has two copies of the recessive allele (e.g., 'bb').

Front

What does heterozygous mean?

Back

An organism is heterozygous if it has one dominant and one recessive allele (e.g., 'Bb').

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism is represented as 'BB'.

Front

In a Punnett Square, what does each box represent?

Back

Each box represents a possible genotype of the offspring resulting from the combination of alleles from the parents.

Front

If a parent has the genotype 'Bb', what alleles can they pass on to their offspring?

Back

They can pass on either 'B' (dominant) or 'b' (recessive).

Front

What is the expected phenotypic ratio from a Bb x Bb cross?

Back

The expected phenotypic ratio is 3:1 (3 brown fur: 1 white fur).