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.

Tags

NGSS.HS-LS4-3

Front

What are alleles?

Back

Alleles are different forms of a gene that can exist at a specific locus on a chromosome.

Front

What does dominant mean in genetics?

Back

A dominant allele is one that expresses its trait even when only one copy is present.

Front

What does recessive mean in genetics?

Back

A recessive allele is one that only expresses its trait when two copies are present.

Front

How do you represent alleles?

Back

Alleles are typically represented by letters, with uppercase letters for dominant alleles and lowercase letters for recessive alleles.

Front

What is the genotype?

Back

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

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-2

Front

What is the phenotype?

Back

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

Front

What is a homozygous genotype?

Back

A homozygous genotype has two identical alleles for a trait, such as AA or aa.

Front

What is a heterozygous genotype?

Back

A heterozygous genotype has two different alleles for a trait, such as Aa.

Front

What is the purpose of a test cross?

Back

A test cross is used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual.