Genetics Review

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by the alleles inherited from its parents.

Front

How many genotypes are possible for a blue-eyed individual?

Back

1

Front

What is a Punnett square used for?

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 is the likelihood that an offspring is homozygous recessive if both parents are heterozygous?

Back

1 in 4, or 25%.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene.

Front

What is the phenotype of an organism?

Back

The phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

In genetics, what does codominance mean?

Back

Codominance 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 for offspring from a cross between two heterozygous parents (Rr x Rr) in a codominant trait?

Back

1 red: 2 roan: 1 white.

Front

What is the significance of the brown-eyed bear producing only brown-eyed offspring?

Back

It indicates that the brown-eyed bear is likely homozygous dominant for the brown eye color trait.