pedigrees

Front

What does a vertical line coming down from a square and circle that are connected by a horizontal line indicate?

Back

They are children.

Front

What percentage of the offspring will have a recessive disease if both parents are carriers?

Back

25%.

Front

Is the trait represented by shaded individuals in a pedigree dominant or recessive?

Back

Recessive.

Front

Freckles (F) are dominant over nonfreckles (f). What is the phenotype of an individual with genotype Ff?

Back

Freckles.

Front

In a pedigree, what shape represents a male?

Back

Square.

Front

In a pedigree, what shape represents a female?

Back

Circle.

Front

What does a horizontal line connecting a square and circle represent in a pedigree?

Back

Marriage or mating.

Front

If a trait is dominant, what is the probability of an offspring expressing the trait if one parent is homozygous dominant and the other is homozygous recessive?

Back

100%.

Front

What does it mean if an individual is a carrier for a recessive trait?

Back

They have one dominant and one recessive allele but do not express the recessive trait.

Front

What is the purpose of a pedigree chart?

Back

To track the inheritance of traits across generations.