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Skin color in a certain species of fish is inherited via a single gene for which there are four different alleles in a particular population. With regard to this gene, how many different types of gametes would be possible in this population? 2 4 08 O 16 Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed among themselves, and the following progeny were produced: 302 gray and 98 white. (a) What is the most probable genotype of each parent? (b) Based on your answer in (a) above, what genotypic and phenotypic ratios are expected in these progeny? (Assume the following symbols: G = gray and g – white.) (a) GG gg: (b) genotypic = 3:1, phenotypic – 1:2:1 (a) Gg Gg: (b) genotypic – 1:2:1, phenotypic = 3:1 (a) GG Gg: (b) genotypic – 1:2:1, phenotypic = 2:1 (a) g8Gg: (b) genotypic – 1:2, phenotypic – 3:1 Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the offspring of crosses BbTt BBtt will be expected to have black fur and long tails? 01/16 3/8 1/2 9/16 When nutrients are low, cells of the budding yeast (Saccharomyces cerevisiae) exit the mitotic cell cycle and enter meiosis. Researchers grew a culture of yeast cells in a nutrient-rich medium and then transferred them to a nutrient-poor medium to induce meiosis. At different times after induction, the DNA content per cell was measured in a sample of the cells, and the average DNA content per cell was recorded in femtograms (fg). A graph of the DNA amounts over time since the beginning of incubation, is below. A diploid, 2N yeast cell before replication, contains DOSSI SIG.-ME 1 MIII 45 40 35 Average amount of DNA percell (fy) how much DNA? 20- 15- 10- 5 0 0 1 2 3 4 5 6 7 8 4 10 11 12 13 14 Time after induction thr) 12 fg 24 fg 48 fg 16 fg When nutrients are low, cells of the budding yeast (Saccharomyces cerevisiae) exit the mitotic cell cycle and enter meiosis. Researchers grew a culture of yeast cells in a nutrient-rich medium and then transferred them to a nutrient-poor medium to induce meiosis. At different times after induction, the DNA content per cell was measured in a sample of the cells, and the average DNA content per cell was recorded in femtograms. A graph of the DNA amounts over time since the beginning of incubation, is below. About how many hours of incubation pass before cells begin the first round of cytokinesis I? 1556 SI 6-MI MII 1 Average amount of DNA percell (fy 阳阳%%式如下osa 0+ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time after Induction (hr) 1 hr 3 hrs 7 hrs 9.5 hrs

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