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Mendelian Genetics Group Review
1. Describe Mendel’s laws of Dominance, Segregation, and Independent Assortment.
Connect segregation and independent assortment to events in meiosis.
2. Explain the difference between dominant and recessive alleles. Provide an example of a
simple dominant-recessive inheritance pattern.
3. Explain the difference between codominance and incomplete dominance. Provide
examples of each.
4. Explain the phenomena of gene-linkage and sex-linked traits and give examples of each.
5. Explain polygenic inheritance patterns, how polygenic traits can be identified, and give
an example of a polygenic trait in the human population.
6. What is the difference between an autosomal dominant and an autosomal recessive
genetic disease?
7. Explain how sex determination is accomplished in mammals, and describe two sex
chromosomal abnormalities and how they affect the organism.
8. Explain how an organism's phenotype is dependent on its genetics and its environment.
9. Explain how natural selection works directly on the phenotype (not genotype) of the
organism.
10. Describe what sex-linked traits are. Give examples of problems involving sex-linked
traits.
11. Be able to determine genotype and gamete probabilities. What is the probability of
parents with genotypes AaBb and AABb having an offspring with genotype AABB?
12. Be able to do problems with blood typing.
13. In pea plants, smooth seeds are dominant to wrinkled, and purple flowers are dominant
to white. In a dihybrid cross where a 9:3:3:1 ratio is expected, the following data was
collected. Smooth and Purple= 223, Smooth and White= 84, Wrinkled and Purple= 89,
Wrinkled and White= 33. Determine the chi-square value.
14. The following data were collected from a population of fruit flies. In this monohybrid
cross where red eyes are dominant to white, determine the chi square value.
Phenotype
Red Eyes
White Eyes
# flies observed
140
60
15. When yellow (dominant) guinea pigs are crossed with white ones, they always produce
cream colored offspring. What is the phenotypic ratio of the offspring from two cream
colored guinea pigs?
16. Dimples are inherited as a simple dominant gene. A dimpled man whose mother has no
dimples, marries a woman with no dimples. What is the chance that they will have a
child with no dimples?
17. Brown-spotted teeth in humans is due to a dominant sex-linked trait. What percent of
the children would you expect to have spotted teeth when a man with spotted teeth
marries a woman with normal white teeth?
18. The shape and color of radishes are controlled by two independent pairs of alleles. The
color may be red (RR), purple (Rr), or white (rr), and the shape may be long (LL), oval
(Ll), or round (ll). Using the Punnett square, diagram a cross between red, long radishes
(RRLL) and white, short radishes (rrll). What percent of the F2 generation should have
red and oval fruit?