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 a filled circle represent in a pedigree?

Back

A filled circle represents an affected female.

Front

What does a filled square represent in a pedigree?

Back

A filled square represents an affected male.

Front

What does an open circle represent in a pedigree?

Back

An open circle represents a not affected female.

Front

What does an open square represent in a pedigree?

Back

An open square represents a not affected male.

Front

What is the difference between a dominant and recessive trait?

Back

A dominant trait is expressed when at least one dominant allele is present, while a recessive trait is only expressed when two recessive alleles are present.

Front

How can you determine the genotype of an individual from a pedigree?

Back

You can determine the genotype by analyzing the phenotypes of the individual and their relatives, considering the inheritance patterns.

Front

What is the significance of generations in a pedigree?

Back

Generations in a pedigree indicate the lineage and help track the inheritance of traits over time.

Front

How do you read a pedigree chart?

Back

You read a pedigree chart by following the lines connecting individuals, noting the symbols for affected and unaffected individuals.

Front

What does it mean if a trait skips a generation in a pedigree?

Back

If a trait skips a generation, it may indicate that the trait is recessive and can be carried by individuals without being expressed.