Genetics

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genotypes of a particular cross or breeding experiment. It shows the possible combinations of alleles from the parents.

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that will appear in the phenotype even if only one allele is present. It masks the effect of a recessive allele.

Front

What is the genotypic ratio of a cross between two heterozygous plants (Tt x Tt)?

Back

1:2:1

Front

What is the definition of heterozygous?

Back

Heterozygous refers to having two different alleles for a specific gene, such as Bb.

Front

What is the expected phenotype of offspring from a WW x ww cross?

Back

All offspring will have white hair.

Front

How many alleles does an offspring receive from each parent?

Back

One allele from each parent.

Front

What is the chance of a blue-eyed baby from two brown-eyed parents (Bb x Bb)?

Back

25% chance.

Front

What is a recessive trait?

Back

A recessive trait is one that will only appear in the phenotype if two copies of the recessive allele are present.

Front

What does the term 'allele' mean?

Back

An allele is a variant form of a gene that can produce different traits.

Front

What is the phenotypic ratio of a cross between two heterozygous plants (Tt x Tt)?

Back

3:1