Biology questions, please show work for all five problems
Extra Credit: Due Weds November 23 (10pts possible). Staple your answers to this handout, showing your work. Only
correct answers will be awarded points.
1. Show all of the different kinds of gametes which could be produced by the following individuals: (2pts)
2. In dogs, wire hair is due to a dominant gene (W), smooth hair is due to its recessive allele (w). (2pts)
(a) If a homozygous wire-haired dog is mated with a smooth-haired dog, what type of offspring could be produced?
(b) What types of offspring could be produced in the F2?
(c) Two wire-haired dogs are mated. Among the offspring of their first litter is a smooth-haired pup. If these two
wire-haired dogs mate again, what are the chances that they will produce another smooth-haired pup? What are the
chances that the pup will be wire-haired?
(d) A wire-haired male is mated with a smooth-haired female. The mother of the wire-haired male was smoothhaired. What are the phenotypes and genotypes of the pups they could produce?
3. In snapdragons, red flower color is incompletely dominant over white flower color; the heterozygous plants have pink
(a) If a red-flowered plant is crossed with a white-flowered plant, what are the genotypes and phenotypes of the F1
(b) What genotypes and phenotypes can be produced in the F2 generation?
(c) What kinds of offspring can be produced if a red-flowered plant is crossed with a pink-flowered plant?
(d) What kinds of offspring can be produced if a pink-flowered plant is crossed with a white-flowered plant?
4. In humans, the presence of freckles is due to a dominant gene (F) and the non-freckled condition is due to its recessive
allele (f). Dimpled cheeks (D) is dominant to non-dimpled cheeks (d). Two persons with freckles and dimpled cheeks have
two children: one has freckles but no dimples and one has dimples but no freckles. (2pts)
(a) What are the genotypes of the parents?
(b) What are the possible phenotypes and genotypes of the children which they could produce?
(c) What are the chances that they would have a child which lacks both freckles and dimples?
(d) A person with freckles and dimples whose mother lacked both freckles and dimples marries a person with
freckles but no dimples whose father did not have freckles or dimples. What are the chances that they would have a
child which lacks both freckles and dimples?
5. In humans, colorblindness is a recessive sex-linked trait. (2pts)
(a) Two normal people have a colorblind son. What are the genotypes of the parents? What genotypes and
phenotypes are possible among their children?
(b) A couple has a colorblind daughter. What are the possible genotypes and phenotypes of the parents and the
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