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.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an individual, represented by letters (e.g., AA, Aa, aa).

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is a phenotype?

Back

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

Tags

NGSS.HS-LS1-1

Front

What is the probability of offspring having homozygous alleles if both parents are heterozygous?

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 is the genotype of the offspring?

Back

All offspring will be heterozygous (Aa).

Front

What is the expected phenotype ratio for a monohybrid cross between two heterozygous parents?

Back

The expected phenotype ratio is 3:1.

Tags

NGSS.HS-LS3-3

Front

How do you determine the probability of a specific phenotype using a Punnett square?

Back

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

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-3

Front

What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in heterozygous individuals.