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1. Most of the individuals of a certain wildflower population have white flowers, although a few are purple-flowered. Crosses have demonstrated that allele for white color flower (W) is dominant over the allele for purple (w).
a. Give the genotype of a purple-flowered plant, and show the gametes that it would produce as a result of meiosis.
b. If two heterozygous whoite-flowered plants are crossed. What fraction of the offspring do you expect to be purple?
c. If two purple-flowered plants are crossed, what fraction of their offspring do you expect to be white?
2. In one study, Gregor Mendel crossed yellow-seeded, tall garden pea with a green-seeded, short garden pea. The F1 offspring were all yellow-seeded and tall. Assuming independent assortment of these two genes, what
3. Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either spiny (S) or smooth (s). These two genes are located on non homologous chromosomes.
a. What is/are the phenotypes and genotypes of the offspring that result from the cross PPss x PpSs?
b. If the cross PpSS x ppSs is made, which of the following is/are not represented in the offspring?
i. PpSS
ii. PpSs
iii. ppSS
iv. ppSs
v. PPSs
4. Sesame plants produce seed pods with one chamber (O) or three chambers (o), and leaves that are normal (N) or wrinkled (n). The two traits are inherited independently. Determine the genotypes and phenotypes of the two parents that produced the following offspring: 304 with one-chamber pods and normal leaves; 100 one-chamber pods and wrinkled seeds; 298 with three-chamber pods and normal leaves; 103 with three chamber pods and wrinkled leaves.
5. A rooster with gray feathers is mated with a hen of the same phenotype. Among her offspring, 15 chicks are gray, 6 are black, and 8 are white. What is the simplest explanation for the inheritance of these colors in chickens? What offspring would predict from the mating of a gray rooster and a black hen?
6. A man with group A blood marries a woman with group B blood. Their child has group O blood. What are the genotypes of these individuals? What other genotypes, and in what frequencies, would you expect in offspring from this marriage?
7. Color pattern in a species of duck is determined by one gene with three alleles. Alleles H and l are codominant, and allele I is recessive to both. How many phenotypes are possible in a flock of ducks that contains all the possible combinations of these three alleles?
8. The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the possibilities that F2 ossrping would have the following genotypes?
a. Aabbccdd
b. AaBbCcDd
c. AABBCCDD
d. AaBBccDd
e. AaBBCCdd
9. What is the probability that each of the following pairs of parents will produce the indicated offspring? (assume independent assortment of all gene pairs)
a. AABBCC x aabbcc = AaBbCc
b. AABbCc x AaBbCc = AAbbCC
c. AaBbCc x AaBbCc = AaBbCc
d. aaBbCC x AABbcc = AaBbCc
10. In humans, the genes for coloblindedness and hemophilia re both located on the X chromosome with no corresponding gene in the Y. These are both recessive alleles.
a. If a man and a woman, both with normal vision, marry and have a colorblind son, draw the Punnet square that illustrates this.
b. If the man dies and the woman remarries to a colorblind man, draw a Punnet Square showing the type of children could be expected from hre second marriage. How many/what percentages of each could ne expected.
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