Punnett Squares

Front

What is a Punnett Square used for in genetics?

Back

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

Front

Define dominant allele.

Back

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

Tags

NGSS.HS-LS1-1

Front

Define recessive allele.

Back

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

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous when it has two different alleles for a particular gene (e.g., Bb).

Front

What is the probability of producing a homozygous recessive offspring from a Tt x Tt cross?

Back

The probability is 25%.

Tags

NGSS.HS-LS3-3

Front

In a genetic cross, what does a capital letter represent?

Back

A capital letter represents a dominant allele.

Front

In a genetic cross, what does a lowercase letter represent?

Back

A lowercase letter represents a recessive allele.

Front

What is the phenotype of an organism with the genotype 'Ff'?

Back

The phenotype is determined by the dominant allele, so it would express the dominant trait.

Front

How do you determine the genotypes of parents in a Punnett Square?

Back

The genotypes of the parents are determined by the alleles they contribute to the offspring, which are represented on the sides of the Punnett Square.

Front

What is the expected phenotypic ratio from a Tt x Tt cross?

Back

The expected phenotypic ratio is 3 tall: 1 short.