Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their alleles.

Front

What does a dominant allele do?

Back

A dominant allele masks the effect of a recessive allele in the phenotype of an organism.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait if two copies are present (i.e., no dominant allele is present).

Front

What does it mean to be purebred?

Back

An organism is purebred if it has two identical alleles for a trait (e.g., TT or tt).

Front

What does it mean to be hybrid?

Back

An organism is hybrid if it has two different alleles for a trait (e.g., Tt).

Front

What is the genotype?

Back

The genotype is the genetic makeup of an organism, represented by the alleles it carries (e.g., TT, Tt, tt).

Front

What is the phenotype?

Back

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

Front

How do you calculate the probability of a trait appearing in offspring?

Back

You can calculate the probability by using a Punnett Square to determine the possible genotypes of the offspring.

Front

What does 'Bb' represent in genetics?

Back

'Bb' represents a heterozygous genotype where 'B' is a dominant allele and 'b' is a recessive allele.

Front

What is the expected phenotype ratio from a monohybrid cross?

Back

The expected phenotype ratio from a monohybrid cross is typically 3:1 for dominant to recessive traits.