Genetics and Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses, such as BB, Bb, or bb.

Front

What is a phenotype?

Back

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

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the possible genotypes of offspring from a genetic cross.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as BB or bb.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Bb.

Front

What is the purpose of a Punnett square?

Back

The purpose of a Punnett square is to predict the probability of certain genotypes and phenotypes in offspring.

Front

What is the expected genotype ratio from a monohybrid cross of two heterozygous parents (Bb x Bb)?

Back

The expected genotype ratio is 1 BB : 2 Bb : 1 bb.

Front

What is the expected phenotype ratio from a monohybrid cross of two heterozygous parents (Bb x Bb)?

Back

The expected phenotype ratio is 3 brown eyes : 1 blue eyes.

Front

What is the probability of having a child with blue eyes if one parent is homozygous BB and the other is homozygous bb?

Back

The probability is 0%.

Front

What is the probability of having a child with blue eyes if both parents are heterozygous (Bb)?

Back

The probability is 25%.