Heredity Part II

Front

What does a Punnett square predict?

Back

Genetic outcomes

Front

What do the letters in a Punnett square represent?

Back

Egg and Sperm

Front

What does it mean if an allele is described as 'dominant'?

Back

It is always expressed if present.

Front

Which type of genotype consists of two different alleles?

Back

Heterozygous

Front

What is the probability of children inheriting a recessive trait if both parents are heterozygous?

Back

25%.

Front

Define 'allele'.

Back

An allele is a variant form of a gene.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous has identical alleles; heterozygous has different alleles.

Front

What is a recessive allele?

Back

An allele that is only expressed when two copies are present.

Front

What is the purpose of a test cross?

Back

To determine the genotype of an organism with a dominant phenotype.

Front

What does it mean for a trait to be polygenic?

Back

It is controlled by multiple genes.