Punnett Squares

Front

What does Aa represent in genetics?

Back

Heterozygous (hybrid)

Front

When a dominant and a recessive allele are present, which trait is expressed?

Back

Dominant

Front

What is the genotype for tt?

Back

Recessive

Front

What does heterozygous mean?

Back

Different genes (alleles) for a trait.

Front

In a Punnett square, if B = brown fur and b = white fur, what is the probability of getting white fur from Bb x Bb?

Back

50%.

Front

What is a Punnett square used for?

Back

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

Front

Define homozygous.

Back

Having two identical alleles for a trait.

Front

What is the phenotype of an organism?

Back

The observable characteristics or traits of an organism.

Front

What is the difference between genotype and phenotype?

Back

Genotype is the genetic makeup, while phenotype is the physical expression of that makeup.

Front

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

Back

The organism must have two recessive alleles.