Punnett Squares

Front

What does a Punnett square represent in genetics?

Back

A Punnett square is a diagram used to predict the genotype and phenotype combinations of offspring from a genetic cross.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two.

Front

What is the genotype of a parent that can produce both brown and white fur offspring?

Back

Bb (heterozygous for the trait).

Front

If B = brown fur and b = white fur, what is the probability of an offspring having white fur from a Bb x Bb cross?

Back

50%.

Front

What genotype would be found in box 1 of a Punnett square if the other parent is Bb?

Back

BB (homozygous dominant).

Front

What is the phenotype ratio of offspring from a cross between BB and bb parents?

Back

All offspring will have the phenotype of brown fur.

Front

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

Back

Count the number of times the desired phenotype appears in the Punnett square and divide by the total number of possible outcomes.

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits or characteristics.

Front

What does a 1:2:1 ratio in a Punnett square indicate?

Back

It indicates a monohybrid cross where one trait is incompletely dominant.

Front

What is the significance of the letters used in a Punnett square?

Back

The letters represent alleles, with uppercase letters indicating dominant alleles and lowercase letters indicating recessive alleles.