Unit 7 Genetics

Front

What is a pedigree?

Back

A diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors.

Front

How many generations are typically shown in a pedigree chart?

Back

A pedigree chart can show multiple generations, often 3 to 4.

Front

What does a genotypic ratio represent?

Back

The ratio of different genotypes that can result from a genetic cross.

Front

What is the genotypic ratio for a monohybrid cross?

Back

1:2:1.

Front

What is a sex-linked trait?

Back

A trait controlled by alleles located on the X chromosome.

Front

Give an example of a sex-linked trait.

Back

Color blindness and hemophilia.

Front

What does it mean if a trait is sex-linked?

Back

It means the trait is associated with genes found on the sex chromosomes, particularly the X chromosome.

Front

How can a pedigree be used in genetics?

Back

To determine if a trait is inherited, if it is sex-linked, and to analyze genetic distances in a family.

Front

What is the phenotypic ratio for a monohybrid cross?

Back

3:1.

Front

What are alleles?

Back

Different forms of a gene that can exist at a specific locus on a chromosome.