Genetics and 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 does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene (e.g., Tt).

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed when at least one dominant allele is present, while recessive traits are only expressed when two recessive alleles are present.

Front

What is the probability of obtaining a brown-haired offspring (A-Brown hair; a-blond hair) from a cross of Aa x Aa?

Back

75% Brown Hair and 25% Blond Hair.

Front

What is the genotype for a homozygous dominant individual?

Back

The genotype for a homozygous dominant individual is represented as 'AA'.

Front

What is the genotype for a homozygous recessive individual?

Back

The genotype for a homozygous recessive individual is represented as 'aa'.

Front

If A = red fur and a = white fur, what is the probability of red fur from a cross of Aa x aa?

Back

50% Red Fur and 50% White Fur.

Front

What is the phenotype of an individual with the genotype Yy? (Y=Yellow, y=blue)

Back

Yellow, since it is the dominant trait.

Front

What does it mean if an allele is dominant?

Back

An allele is dominant if it masks the effect of a recessive allele when both are present in a heterozygous individual.