Practice Flashcard Heredity with Pedigrees and Punnett Squares

Front

What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., TT, Tt, tt).

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene (e.g., TT or tt).

Front

What does homozygous recessive mean?

Back

Homozygous recessive means having two identical recessive alleles (e.g., tt).

Front

What does homozygous dominant mean?

Back

Homozygous dominant means having two identical dominant alleles (e.g., TT).

Front

What is a dominant trait?

Back

A dominant trait is a characteristic that is expressed when at least one dominant allele is present (e.g., A in Aa or AA).

Front

What is a recessive trait?

Back

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

Front

What does a filled square represent in a pedigree chart?

Back

A filled square represents an affected male in a pedigree chart.

Front

What does a filled circle represent in a pedigree chart?

Back

A filled circle represents an affected female in a pedigree chart.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

How do you determine the possible genotypes for a dominant trait?

Back

The possible genotypes for a dominant trait include homozygous dominant (AA) and heterozygous (Aa).