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.

Front

What does 'dominant' mean in genetics?

Back

A dominant trait is one that will appear in the offspring if at least one parent contributes it.

Front

What does 'recessive' mean in genetics?

Back

A recessive trait is one that will only appear in the offspring if both parents contribute it.

Front

If a trait is represented by 'R', what does it signify?

Back

'R' signifies a dominant trait.

Front

If a trait is represented by 'r', what does it signify?

Back

'r' signifies a recessive trait.

Front

What is the probability of getting a dominant trait if one parent is homozygous dominant (RR) and the other is homozygous recessive (rr)?

Back

100% of the offspring will have the dominant trait.

Front

In a cross between a heterozygous tall plant (Tt) and a short plant (tt), what is the probability of getting a tall plant?

Back

50% of the offspring will be tall.

Front

What is the purpose of using a Punnett Square?

Back

To visualize and calculate the probability of different genetic outcomes in offspring.

Front

What does it mean if an offspring has a genotype of 'tt'?

Back

The offspring is short because it has two recessive alleles.

Front

If a plant with genotype 'Tt' is crossed with another 'Tt', what is the probability of getting a homozygous recessive offspring?

Back

25% of the offspring will be homozygous recessive (tt).