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.

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 makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

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

Front

What is the difference between dominant and recessive alleles?

Back

Dominant alleles are expressed in the phenotype even when only one copy is present, while recessive alleles are only expressed when two copies are present.

Front

If 'G' represents green skin and 'g' represents brown skin, what is the phenotype of a frog with genotype 'Gg'?

Back

The phenotype of a frog with genotype 'Gg' is green skin, because 'G' is dominant.

Front

How do you calculate the percentage of offspring with a certain trait using a Punnett Square?

Back

Count the number of boxes that show the desired trait and divide by the total number of boxes, then multiply by 100.

Front

What is the probability of getting a homozygous recessive offspring from two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

What does it mean if a genotype is homozygous dominant?

Back

A homozygous dominant genotype has two identical dominant alleles, such as 'AA'.