Punnett Squares and Pedigrees

Front

What does each box in a Punnett square represent?

Back

A 25% chance of possible genes from the parents.

Front

Can 2 right handed people have a left handed baby?

Back

Yes, if they both pass on a recessive left handed gene.

Front

What does it mean if a baby is a carrier for a trait?

Back

The baby has inherited one recessive gene for the trait but does not express it.

Front

What does a half shaded in circle or square represent on a pedigree?

Back

Someone who carries a gene for the trait.

Front

Can Mike and Molly have a left handed child?

Back

No, their child can't be left handed.

Front

What is a Punnett square used for?

Back

To predict the genetic makeup of offspring from two parents.

Front

What is a dominant gene?

Back

A gene that expresses its trait even if only one copy is present.

Front

What is a recessive gene?

Back

A gene that only expresses its trait if two copies are present.

Front

What does a fully shaded circle or square represent on a pedigree?

Back

Someone who has the trait.

Front

What is the purpose of a pedigree chart?

Back

To show the inheritance of traits across generations.