Genetics Review

Front

What is a pedigree?

Back

A diagram that shows the occurrence of a genetic trait in several generations of a family.

Front

How many generations can a pedigree show?

Back

A pedigree can show multiple generations, often more than four.

Front

What is the purpose of using a pedigree?

Back

To track traits and genetic conditions in families over generations.

Front

What does a Punnett square illustrate?

Back

The possible genetic combinations of offspring from two parents.

Tags

NGSS.HS-LS3-2

Front

What is the probability of having a dominant trait if both parents are heterozygous?

Back

75% chance of having a dominant trait.

Tags

NGSS.HS-LS3-3

Front

What does homozygous mean?

Back

Having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does heterozygous mean?

Back

Having two different alleles for a particular gene (e.g., Tt).

Front

What is an allele?

Back

An alternative form of a gene that can produce different traits.

Tags

NGSS.HS-LS3-2

Front

What is the difference between genotype and phenotype?

Back

Genotype is the genetic makeup (e.g., Tt), while phenotype is the observable trait (e.g., tall plant).

Front

What is a recessive trait?

Back

A trait that is only expressed when two recessive alleles are present (e.g., tt).