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 the term 'genotype' refer to?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics of an organism, which result from the interaction of its genotype with the environment.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous genotypes have two identical alleles for a trait (e.g., BB or bb), while heterozygous genotypes have two different alleles (e.g., Bb).

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even in the presence of a recessive allele.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present (homozygous recessive).

Front

How do you calculate the probability of offspring traits using a Punnett Square?

Back

To calculate the probability, fill out the Punnett Square with the parents' alleles and then count the occurrences of each genotype or phenotype.

Front

If a homozygous dominant individual is crossed with a homozygous recessive individual, what will be the genotype of the offspring?

Back

All offspring will be heterozygous (e.g., Bb).

Front

What is the expected phenotypic ratio of a monohybrid cross between two heterozygous individuals?

Back

The expected phenotypic ratio is 3:1 (dominant:recessive).

Front

What is the expected genotypic ratio of a monohybrid cross between two heterozygous individuals?

Back

The expected genotypic ratio is 1:2:1 (homozygous dominant:homozygous recessive:heterozygous).