Pedigrees

Front

What is a pedigree?

Back

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

Front

What does it mean to be homozygous?

Back

An individual is homozygous when they have two identical alleles for a specific trait (e.g., AA or aa).

Front

What does it mean to be heterozygous?

Back

An individual is heterozygous when they have two different alleles for a specific trait (e.g., Aa).

Front

What do squares represent in a pedigree chart?

Back

Squares represent males in a pedigree chart.

Front

What do circles represent in a pedigree chart?

Back

Circles represent females in a pedigree chart.

Front

What is a Punnett square?

Back

A Punnett square is a diagram used to predict the genotypes of offspring from a cross between two parents.

Front

How do you determine the probability of offspring color using a Punnett square?

Back

By filling in the Punnett square with the alleles from each parent and calculating the ratio of each phenotype.

Front

If a red flower (Rr) is crossed with a white flower (rr), what is the probability of getting a red flower?

Back

The probability of getting a red flower is 50%.

Front

What is the genotype of a tall plant if T = tall and t = short?

Back

The genotype could be TT (homozygous tall) or Tt (heterozygous tall).

Front

What is the phenotype of a plant with the genotype tt?

Back

The phenotype of a plant with the genotype tt is short.