Biology: Genetics Problems - 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 does it mean for a trait to be dominant?

Back

A dominant trait is one that will appear in the phenotype even if only one allele is present.

Front

What is the genotype of a homozygous dominant individual?

Back

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

Front

What is the genotype of a heterozygous individual?

Back

The genotype of a heterozygous individual is represented as 'Aa'.

Front

What is co-dominance in genetics?

Back

Co-dominance is a form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is the expected phenotype ratio of offspring from a roan cow and a roan bull?

Back

1: Orange: 2 Orange and White: 1 White.

Front

What does X-linked disorder mean?

Back

An X-linked disorder is a genetic condition that is associated with a gene on the X chromosome.

Front

What is the probability of a son being colorblind if both parents are carriers of colorblindness?

Back

There is a 50% chance that a son will be colorblind.

Front

What is the expected genotype ratio from a cross between a homozygous dominant and a heterozygous individual?

Back

50% BB and 50% Bb.

Front

What does it mean for an individual to be a carrier of a trait?

Back

A carrier is an individual who has one dominant and one recessive allele for a trait, and does not express the recessive trait.