Punnett Squares
Complete a punnet square for TT and tt.
Tt, Tt, Tt, Tt
Jimmy has a big nose. His genotype is GG. Sally also has a big nose. Her genotype is Gg. Create a Punnett square showing their offspring's possible genotypes.
What is GG, GG, Gg, Gg
___________ is the passing down of traits from one generation to the next.
Heredity
Hh, Zz, Xx are examples of what kind of allele combination?
Heterozygous
Refers to an organism with two identical alleles (homozygous) for a trait
Purebred
Complete a Punnett square for Gg and Gg.
GG, Gg, Gg, gg
Jared is homozygous for brown hair. His wife is homozygous for blonde hair. Brown hair is dominant to blonde hair. Create a Punnett square showing their offspring's possible genotypes. (Use the letter B)
What is Bb, Bb, Bb, Bb.
A pair of alleles that are both dominant or both recessive are called __________________.
Homozygous
HH, TT, zz are all examples of what kind of allele combination? (one word)
Homozygous
Why do we use Punnett Squares?
Why we use it: (possible answers)
To see what traits a child might inherit from their parents.
To understand how dominant and recessive genes work.
It helps us visualize how genes are passed down from one generation to the next.
Complete a Punnett square someone who is heterozygous for tall and for someone who is homozygous for short. (Use the letter T)
Tt, Tt, tt, tt
Mike is heterozygous for brown eyes. His wife has blue eyes. What is the percent probability that their offspring would have brown eyes? What is the percent probability for blue eyes?
(hint: make a Punnett square using the letter B)
50% brown and 50% blue eyes
A pair of alleles with one dominant gene, and one recessive gene are called ____________________.
Heterozygous
Jim and Jane are both heterozygous for being tall. What are the chances they will have a short child? (hint: make a Punnett square using the letter T)
25% chance for being short
Tiny parts of DNA that tell our bodies how to work.
Genes
Complete a Punnett square for someone who is Homozygous for green eyes, and someone who has blue eyes. Green is dominant over blue. (Use the letter G)
Gg, Gg, Gg, Gg.
Tim and Jenny both have purple skin, but each of them carries a recessive trait for green skin. What is the percent probability their offspring will have purple skin? What is the percent probability for green skin?
(hint: make a Punnett square using the letter S)
75% purple skin and 25% green skin.
___________________ describes a pair of alleles and is represented by letters such as Tt or TT.
Genotype
GG, Gg, Gg, gg are the outcomes for a Punnett square. Green eyes are dominant to blue eyes. What percent chance would this offspring have green eyes? What percent chance would they have blue eyes?
75% green eyes and 25% blue eyes
A chart that helps us predict the possible traits (like eye color or hair color) that offspring (babies) might have, based on the genes of the parents.
Punnett Square
The four answers for a Punnett square are Zz, Zz, zz, zz. What are the genotypes for each parent?
Zz and zz.
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? (Use the letter B)
Bb
__________________ is the physical expression of the genotype. It is how the trait is expressed (ie. dark hair, tall, big lips, etc.)
Phenotype
What is the study of genes, which are tiny parts of DNA that tell our bodies how to work?
Genetics
Refers to an organism with two different alleles (heterozygous) for a trait
Hybrid