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.

Tags

NGSS.HS-LS3-2

Front

What do the letters in a Punnett square represent?

Back

The letters represent alleles, where uppercase letters denote dominant alleles and lowercase letters denote recessive alleles.

Front

What is the difference between homozygous and heterozygous alleles?

Back

Homozygous alleles are identical (e.g., AA or aa), while heterozygous alleles are different (e.g., Aa).

Front

What does it mean for an organism to be homozygous dominant?

Back

An organism is homozygous dominant if it has two dominant alleles for a trait (e.g., AA).

Front

What does it mean for an organism to be homozygous recessive?

Back

An organism is homozygous recessive if it has two recessive alleles for a trait (e.g., aa).

Front

What does it mean for an organism to be heterozygous?

Back

An organism is heterozygous if it has one dominant and one recessive allele for a trait (e.g., Aa).

Tags

NGSS.HS-LS4-2

Front

How do you calculate the probability of offspring having a specific genotype?

Back

The probability is calculated by counting the number of times the genotype appears in the Punnett square and dividing by the total number of possible outcomes.

Tags

NGSS.HS-LS3-3

Front

What is the phenotype of an organism?

Back

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

Front

What is the probability of obtaining a homozygous recessive offspring from two heterozygous parents?

Back

The probability is 25%.

Tags

NGSS.HS-LS3-3

Front

If one parent is homozygous dominant (AA) and the other is homozygous recessive (aa), what are the possible genotypes of the offspring?

Back

All offspring will be heterozygous (Aa).

Tags

NGSS.HS-LS3-1