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Dear Sir
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Eugene
Q3. The following is a pedigree for a rare human trait: (10 Marks)
a. What is the most probable mode of inheritance for the trait indicate above? Give reasons. (3 Marks)
b. If individuals III-3 and III-8 marry, what is the probability of them having a child with the trait? (3.5 Marks)
c. If individuals IV-1 and IV-10, what is the probability of them having a child who expresses the trait? (3.5 marks)
a. which diagram(s) shows synapsis? (1 Mark)
b. Which diagram(s) starts with a haploid cell? (1 Mark)
c. In which diagram did segregation of both chromosome pairs occur? (1 Mark)
d. What phenomenon occurred in division # IV? (1 Mark)
If a dog has 39 chromosomes in its sex cell how many chromosomes are in its body cell
Skin colour in humans ranges from very dark to very light. Which of the following most likely describes how skin colour is inherited?
4. In Jimsonweed, purple flower color (P) is dominant over white (p) and spiny pods (S) over smooth pods (s). These pairs of alleles are not linked. A Jimsonweed of genotype PPss is crossed with one of ppss. What is the genotype of the F1 generation? The phenotype?
5. In peas, the gene for tall plants (T) is dominant over the gene for dwarf plants (t) and round seed (R) is dominant over wrinkled seed (r). If one crosses a homozygous tall, wrinkled-seeded plant with a homozygous dwarf, round-seeded plant, what is the phenotype of the F1? The genotype of the F1? The phenotypic ratio of the F2?
6. If the cross BbDD X bbDd is made, which of the following would not be represented in the offspring?
a. BbDD; b. BbDd; c. bbDD; d. bbDd; e. BBDd
Four o'clocks exhibit incomplete dominance. Thus, if a plant with red flowers is crossed with a plant with white flowers, the offspring will all produce pink flowers. What offspring would you expect if you crossed a red-flowered plant with a pink-flowered plant?
II. DIHYBRID CROSSES
3. How many different kinds of gametes can an organism of genotype RrSS produce? List them.
1. Most individuals of a certain wild flower have white petals, but a few are blue. Crosses have shown that the blue color is due to a recessive allele. Use "W" for white and "w" for blue.
a. What is the genotype of a blue-flowered plant and what gametes would it produce as a result of meiosis?
b. What is/are the genotype(s) of each of a blue-flowered plant's parents?
c. If a blue-flowered plant has two white-flowered parents, and the parents produced many offspring, what fraction of them would you expect to be blue?
d. If a blue-flowered plant is crossed with its white-flowered parent, what fraction of their offspring would have the genotype "ww"?
e. If two blue-flowered plants cross, what fraction of their offspring will be blue? White?
The following pedigree analysis shows the inheritance of a recessive trait.
a. If individuals III-3 and III-8 marry, what is the probability of them having a child who phenotypically expresses the trait?
b. If individuals IV-1 and IV-10 marry, what is the probability of them having a child who phenotypically expresses the trait?
Q1. The following diagrams represent cells from a diploid organism with (2n=4) undergoing different stages of a division designated as (I,II, III,IV):
a. for each of the divisions, describe and conclude the type of division and its specific stage. (1.5 Marks each)
