5.1 Amoeba Sisters Alleles and Genes

Front

What determines the ability to taste PTC?

Back

Genetics

Front

If both parents can taste PTC, what is their likely genotype?

Back

Tt for both parents

Front

How many chromosomes do humans have?

Back

46

Front

What genotype combination allows a person to taste PTC?

Back

Both TT and Tt

Front

What does a dominant allele mean?

Back

It is expressed if present.

Front

What is an allele?

Back

An allele is a variant form of a gene.

Front

What is the difference between a dominant and a recessive allele?

Back

A dominant allele is expressed in the phenotype even if only one copy is present, while a recessive allele is only expressed when two copies are present.

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene.