Genetics and punnett squares

Front

What is the probability of offspring having Brown hair (A) and Blond hair (a) if the parents are heterozygous (Aa)?

Back

75% Brown Hair and 25% Blond Hair.

Front

What does it mean if an organism has a heterozygous genotype?

Back

It has two different alleles for a trait, such as Qq.

Front

What trait is expressed in an organism with the genotype Yy? (Y=Yellow, y=blue)

Back

Yellow, since it is the dominant trait.

Front

What is the term for the genetic makeup of an organism represented by letters?

Back

Genotype.

Front

What is the probability of offspring having homozygous alleles if the parents are heterozygous (Aa)?

Back

50%.

Front

What is a Punnett Square used for?

Back

To predict the genetic outcomes of a cross between two organisms.

Front

Define phenotype.

Back

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 mask the effect of recessive alleles in heterozygous conditions.

Front

If a trait is recessive, what must the genotype be for it to be expressed?

Back

The genotype must be homozygous recessive (e.g., aa).

Front

What does homozygous mean?

Back

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