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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.

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What does dominant mean in genetics?

Back

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

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What does recessive mean in genetics?

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

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How do you represent alleles?

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

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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?

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

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What is a heterozygous genotype?

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

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What is the purpose of a test cross?

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