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Name: ____________________________________
Period _____
Genetics Study Guide: Chapters 11, 13, & 14
Key Concepts to Guide Your Studying
(NOT ALL INCLUSIVE! This is just a starting point)
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What happens during each phase of Meiosis I and Meiosis II?
What is nondisjunction in relation to meiosis and genetic disorders?
Explain the principle of independent assortment in relation to meiosis.
What did Gregor Mendel discover when he crossed a tall plant with a short plant?
Explain the principle of dominance
Explain the principle of segregation
What is the purpose of using Punnett squares?
Explain the principle of probability in terms of heredity.
How to do Punnett squares vs. dihybrids (Sex-linked traits, blood types, incomplete
dominance, codominance, etc…)
What are some examples of incomplete dominance, polygenic inheritance,
codominance, and multiple alleles in real life?
What is a karyotype and why is it important? Autosome? Sex Chromosome? How many
chromosomes do humans have? How many homologous pairs do humans have?
Components of genetic engineering
Pros/cons of genetic engineering
Name: ____________________________________
Period _____
Autosomal Traits: Monohybrid Cross
5. In guinea pigs, black fur is dominant over white fur. A black guinea pig is crossed with another
black guinea pig and produces 25% white guinea pigs. What are the genotypes of the parents?
Name: ____________________________________
Period _____
Pokemon Dihybrid Cross Practice
Blue Skin (B) is dominant to pink skin (b)
Spiky tails (S) are dominant to smooth tails (s)
Lightning tails (L) are dominant to straight tails (l)
Red cheeks (R) are dominant to no color cheeks (r)
6. Vapereon is known for her Blue skin and spiky tail. Through genetic testing we have discovered
that she is heterozygous for both conditions. If she were to mate with a male with pink skin and a
smooth tail, what would their offspring look like?
7. Pikachu loves his lightning tail and red cheeks, he found out that he is homozygous for both
traits. His mate is heterozygous for her lightning tail and does not have color in her cheeks. What
would their offspring look like?
Name: ____________________________________
Period _____
Determining Blood Types: Multiple Alleles
In humans, there are four blood types: A, B, AB, and O. The alleles A and B are codominant to each
other and O is the recessive. For instance, a person with the genotype AA or AO will have type A
blood and a person with the genotype OO would have type O blood.
Write the possible genotypes for the following phenotypes:
Type A blood ________ & _________
Type B blood ________ & _________
Type AB blood _________________
Type O blood _________________
8. You are blood type O and you marry a person with type AB. What are the possible blood types
for your offspring? Show your work.
9. A man with heterozygous type B marries a woman with heterozygous type A. What are the
chances of having children with type A, B or O blood? Show your work.
Name: ____________________________________
Period _____
Incomplete Dominance & Codominance
10. In the following incomplete dominance relationship, birds can have blue, white, or white with
blue-tipped feathers. A bird with blue feathers is crossed with a bird that has white with blue-tipped
feathers. SHOW WORK!!!
What are the parental genotypes? ______________________
How many of the offspring have white feathers? __________
11. In Smiley’s, eye shape can be starred, circular, or a circle with a star. This is a codominant
relationship.
Show the cross between a circle-star eyed, and a circle eyed. SHOW WORK!!!
What are the genotypes of the parents?___________________
How many of the offspring are circle-eyed? _______________
How many of the offspring are circle-star eyed? ___________
Sex-Linked Traits
12. In humans, colorblindness is due to the recessive allele (Xc), and normal vision is due to the
dominant allele (XC). A colorblind man has children with a heterozygous normal woman.
What percent of the offspring would be colorblind? _______________________________
What percent of the males would be colorblind? __________________________________
What percent of the females would be colorblind? ________________________________
Name: ____________________________________
Period _____
13. Hemophilia is a sex-linked trait. A normal man marries a normal woman and they have a child
with hemophilia.
What are the genotypes of the parents? _________________________________________
What is the sex of the child with hemophilia? _________________________________
Pedigrees: The Addams Family Pedigree for Webbed Feet
B = normal feet
b = webbed feet
14. Is Grandpa Addams homozygous or heterozygous for normal feet? ______________________
15. How many children of Gomez and Morticia have webbed feet? _________________________
16. What is the possible genotype of Mother Addams? ___________________________________
17. Predict the genotype and phenotype of New Baby Addams. G: ___________ P: ___________