Vocabulary
The passing down of traits from one generation to the next.
What is heredity?
The method we use today to predict the traits of offspring.
What is the Punnett Square?
Complete a punnet square for TT and tt.
What is Tt, Tt, Tt, Tt
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
Hh, Zz, Xx. What do each of these genotypes have in common?
What is heterozygous?
A gene with a pair of alleles that are the same (or identical).
What is homozygous?
Capital letters are always used to represent these types of alleles.
What are dominant alleles?
Complete a Punnett square for Gg and Gg.
What is GG, Gg, Gg, gg
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
HH, TT, zz. What do each of these genotypes have in common?
What is homozygous?
A gene with a pair of alleles that are different.
What is heterozygous?
A trait that is expressed or shown.
What is a dominant trait?
Complete a Punnett square someone who is heterozygous for tall and for someone who is homozygous for short.
What is Tt, Tt, tt, tt
Mike is heterozygous for brown eyes. His wife has blue eyes, which are recessive. What percentage of their children will most likely have brown eyes? What percentage will most likely have blue eyes?
What is 50% brown eyes and 50% blue eyes.
Jim and Jane are both heterozygous for being tall. What are the chances that they will have a short child?
What is a 25% chance?
This describes the genetic makeup of a pair of alleles and is represented by letters such as Tt or TT.
What is genotype?
This type of trait is hidden by the dominant trait.
What is a recessive trait?
Complete a Punnett square for someone who is Homozygous for green eyes and someone who has blue eyes. Green is dominant over blue.
What is Gg, Gg, Gg, Gg.
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.
GG, Gg, Gg, gg. Green eyes are dominant to blue eyes. What percent have green eyes? What percent have blue eyes?
What is 75% green eyes and 25% blue eyes?
This is simply the physical appearance of the genotype. It is how the trait is expressed (ie. dark hair, tall, blue eyes, etc.)
What is phenotype?
Austrian monk who studied science and mathematics, and is known as the father of modern genetics.
Who is Gregor Mendel?
The four answers for a Punnett square are Zz, Zz, zz, zz. What are the genotypes for the parents?
What is 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?
What is Bb
The gene for the color of some flowers has one allele for red and one for white. When both alleles are present, neither is dominant, and the flower color is pink. What is this called?
What is co-dominance or incomplete dominance?