Punnett Squares

Front

What is a Punnett Square used for?

Back

A Punnett Square is used to predict the genotypes and phenotypes of offspring from a genetic cross.

Front

What does the term 'phenotype' refer to?

Back

Phenotype refers to the observable physical characteristics of an organism, determined by its genotype.

Front

What is the difference between a dominant and a recessive allele?

Back

A dominant allele is expressed in the phenotype even when only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

How do you represent a dominant allele in genetics?

Back

A dominant allele is typically represented by a capital letter (e.g., 'A').

Front

How do you represent a recessive allele in genetics?

Back

A recessive allele is typically represented by a lowercase letter (e.g., 'a').

Front

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

Back

The expected phenotype ratio is 3:1, with 75% showing the dominant phenotype and 25% showing the recessive phenotype.

Front

What does it mean if an organism is homozygous for a trait?

Back

An organism is homozygous for a trait if it has two identical alleles for that trait (e.g., AA or aa).

Front

What does it mean if an organism is heterozygous for a trait?

Back

An organism is heterozygous for a trait if it has two different alleles for that trait (e.g., Aa).

Front

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.