1. In peas green seed (G) is dominant to yellow seed (g), and purple flower (P) is dominant to white flower (p). In a testcross of a green seed, purple flowered plant, 54 green, purple and 50 green white offspring are produced. What gametes were produced by the tested green, purple parent? a) Gp & GP only b) GP, Gp, gP, gp c) GG and PP only d) GP& gp only e) GP only QUES. 2-3. A man of normal phenotype marries a woman of normal phenotype (these will be designated the original parents). They have three children: a son with a genetic disease, and two daughters of normal phenotype. One of the normal phenotype daughters marries a man who has no history of the disease in his family. From this marriage a normal daughter and a son with the disease are produced. (Suggestion: draw the pedigree on your scrap paper) The disease is most likely due to which of the following genetic conditions? a) a dominant autosomal allele b) a recessive autosomal allele c) an X-linked recessive allele 2. 3. The probability that the second normal daughter from the original parents carries the disease allele is a) 1 b) 1/2 c) 1/4 d) 1/8 Ques 4-5. In Drosophila the sex linked gene for red eye (W) is dominant to white eye (w). A cross is done between a homozygous white eyed female, and a hemizygous red eyed male. 4. What types of offspring are normally expected? a) all red eyed males and females b) all red eyed males and all white eyed females c) all red eyed females and both red and white eyed males d) all red eyed females and all white eyed males e) both red and white eyed males and females ges observed rare white eyed females. When he examined ytologically he found that for the sex chromosomes they were Wild-type mice have dark colored coats produced by expression of the normal allele, y. The allele producing yellow coat color, Y, is dominant to y. In the homozygous condition, Y is lethal. In this example the Y allele exhibits a) pleiotrophy b) incomplete domnance c) incomplete penetrance d) variable expression 6. Assume that a cell about to undergo meiosis has a diploid number of 8. Assume that one member of one homologous pair of chromosomes carries the allele A and the other member of the pair carries a. How many copies of the A allele would there be in the cell during prophase 1? a) 1 b) 2 c)3 d)4 e) 8