Download Genetics Review

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Due: Mon Feb 2
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Genetics Review
Label the phases of Meiosis for each of the following images of cells.
In cattle, red fur color (R) is dominant over white fur. Heterozygotes have roan fur (spotted red & white).
A) Which two parent cattle should be bred to produce only roan offspring?
B) Cowniss Everdeen (a roan) must decide between Peeta Moolark (a white bull) and Gale Hawthorn (a
red bull). To help make her decision, Cowniss considers the offspring she will have with either mate.
What fur color will the offspring have if Moolark is the father? What fur color will the offspring have
if Hawthorn is the father? Show both Punnett Squares
Red-green color blindness is caused by a sex-linked recessive allele. A color-blind man marries a woman
with normal vision whose father was color-blind. (a) What is the probability that they will have a colorblind daughter? (b) What is the probability that their first son will be color-blind?
In sesame plants, the one-pod condition (P) is dominant to the three-pod condition (p), and normal leaf
(L) is dominant to wrinkled leaf (l). Pod type and leaf type are inherited independently. Determine the
genotypes for the two parents if the offspring population consists of…
a) 401 one-pod / normal plants
b) 323 three-pod normal plants, 106 three-pod wrinkled plants
c) 150 one-pod normal plants, 147 one-pod wrinkled plants,
51 three-pod normal plants, 48 three-pod wrinkled plants
d) ^Create a Punnett Square that shows the dihybrid cross between the parents of these offspring
The figure below (for Questions 1-4) is a phenotypic pedigree that spans four generations of a family.
F1-d
F1-e
1. Members of the pedigree are gray or white. Which
phenotype – gray or white – is dominant? How you
know dat tho?
F2-a
2. Determine the genotypes of members F1-d and F1-e. Create a Punnett Square for their family.
3. ^What is the genotypic ratio of their offspring? What is the phenotypic ratio?
4. What are all of the possible genotypes for member F2-a?
5. 40 people survive a plane crash in the middle of the ocean, and land on a deserted island with all
necessities including food, water, shelter, and fudge bars. Unbeknownst to them, 6 of the survivors
are carriers for cystic fibrosis – a recessive condition.
A) what is the prevalence of the allele for cystic fibrosis
in the survivor population?
B) assuming that the conditions for hardy-weinberg are
met, what percentage of the population is expected
to contract cystic fibrosis?
6. An isolated lake contains 731 blue fish. 269 yellow fish are introduced to the lake. Within a year,
new baby fishies are seen to be blue, yellow, and green.
A) Assuming that blue fish color is dominant over yellow, find the prevalence of the recessive allele
in the lake.
B) After many generations, how many fish are expected to be blue? Yellow? Green?