Download Name Bozeman A Beginners Guide to Punnett Squares Directions

Name __________________________
Bozeman A Beginners Guide to Punnett Squares
Directions: Watch the Paul Anderson video showing how to do punnett squares
using the following website. Answer the related questions to follow.
http://www.bozemanscience.com/beginners-guide-to-punnett-squares/
1. The two sides of a punnett square represent ___________?
2. The boxes on a punnett square represent ________________?
3. In a monohybrid cross, a homozygous purple plant is crossed with a
homozygous recessive white plant. What are the gametes of each parent?
_____ ______ x _______ ______
Show the possible outcomes of the punnett square.
4. What are the possible outcomes of crossing two heterozygous purple
flowered pea plants? Give phenotypic and genotypic ratios.
5. Incomplete dominance shows only dominant alleles, which come together to
give a third phenotype. What would be the result of crossing a pink (RW)
with another pink (RW) flower?
6. In sex-linked genes, females are XX and males are XY. If a mom is a carrier
for colorblindness, and the dad is a normal male, how many of their children
would be colorblind? What is the sex of the colorblind child?
7. In a dihybrid cross that Mr. Anderson shows:
a. Write down what R and r mean in pea plants,
b. Write down what Y and y represent in pea plants.
c. What are the games produced by a plant that is RrYy?
d. Complete a 16-box punnett square to show the outcomes of
crossing two plants that are both heterozygous for the R and Y
genes.
e. What is the phenotypic ratio of the offspring?
8. Cross RrYy x rryy using a 16-box punnett square to show the results.
How can you take a short cut on the 16-box grid?