Punnett Squares
Word Problems
Vocabulary
Class Notes
100
Complete a punnet square for TT and tt.
What is Tt, Tt, Tt, Tt
100
Jimmy has a big nose. His genotype is GG. Sally also has a big nose. Her genotype is Gg. What are the possibilities for their children's genotypes?
What is GG, GG, Gg, Gg
100
___________ is the passing down of traits from one generation to the next.
What is Heredity.
100
The method we use today to predict the traits of offspring is ________________ .
What is the Punnett Square.
200
Complete a Punnett square for Gg and Gg.
What is GG, Gg, Gg, gg
200
Jared is homozygous for brown hair. His wife is homozygous for blonde hair. Brown hair is dominant to blonde hair. What are the possible genotypes for their children?
What is Bb, Bb, Bb, Bb.
200
A pair of alleles that are the same are called __________________.
What is homozygous.
200
Capital letters are always represented by the _____________ allele, not the recessive allele.
What is dominant.
300

Complete a Punnett square someone who is heterozygous (having 2 different alleles) for tall and for someone who is homozygous (having 2 of the same or identical alleles) for short.

What is Tt, Tt, tt, tt

300
Mike is heterozygous for brown eyes. His wife has blue eyes. What percentage of their children will most likely have brown eyes? What percentage will most likely have blue eyes?
What is 50% brown and 50% blue eyes?
300
A pair of alleles that are different are called ____________________.
What is heterozygous.
300
A _______________ trait is a trait that is expressed or shown.
What is dominant.
400

Complete a Punnett square for someone who is Homozygous (having the same or identical alleles) for green eyes and someone who has blue eyes. Green is dominant over blue.

What is Gg, Gg, Gg, Gg.

400
Tim and Jenny both have dark skin, but each of them carry a recessive trait for light skin. What are the chances that their children will have dark skin? Light skin?
What is 75% dark skin and 25% light skin.
400
___________________ describes a pair of alleles and is represented by letters such as Tt or TT.
What is genotype.
400
A ______________ trait is a trait that is hidden by the dominant gene.
What is recessive.
500

The four answers for a Punnett square are Zz, Zz, zz, zz. What are the genotypes for the parents?

What is Zz and zz.

500
James is homozygous for big lips. His wife also has big lips, but one of their children has small lips. What is his wife's genotype?
What is Bb.
500
__________________ is simply the expression of the genotype. It is how the trait is expressed (ie. dark hair, tall, big lips, etc.)
What is phenotype.
500
What is the first name of the early 20th century scientist who introduced Punnett Squares as a method to predict the traits of offspring?
What is Reginald.
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