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, showing the possible combinations of alleles.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-3

Front

What do homozygous alleles mean?

Back

Homozygous alleles are two identical alleles for a particular gene, such as AA or aa.

Tags

NGSS.HS-LS3-2

Front

What do heterozygous alleles mean?

Back

Heterozygous alleles are two different alleles for a particular gene, such as Aa.

Tags

NGSS.HS-LS3-2

Front

What is the probability of obtaining homozygous alleles from a Punnett square?

Back

The probability can vary based on the parental genotypes, but it can be calculated using the Punnett square.

Tags

NGSS.HS-LS3-3

Front

If a plant has the genotype RR, what is its phenotype?

Back

The phenotype is typically dominant, so it would express the trait associated with the R allele.

Tags

NGSS.HS-LS3-1

Front

What is the phenotype of a plant with genotype rr?

Back

The phenotype is typically recessive, expressing the trait associated with the r allele.

Front

In a Punnett square, how do you determine the probability of a specific phenotype?

Back

Count the number of squares that show the desired phenotype and divide by the total number of squares.

Tags

NGSS.HS-LS3-3

Front

What is incomplete dominance in genetics?

Back

Incomplete dominance is when the phenotype of heterozygous individuals is intermediate between the phenotypes of the two homozygous parents.

Front

If a red flowered plant (RR) is crossed with a white flowered plant (WW), what will be the phenotype of the offspring?

Back

All offspring will have pink flowers (RW) due to incomplete dominance.

Tags

NGSS.HS-LS3-1

Front

What is the expected phenotypic ratio for a monohybrid cross?

Back

The expected phenotypic ratio is typically 3:1 for dominant to recessive traits.