Question #1. How many different kinds of gametes could the following individuals produce? 1. aabb 2. CCDdee 3. AABbCcDD 4. MmNnOoPpQq 5.
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1 GENETIC PROBLEMS
2 Question #1 How many different kinds of gametes could the following individuals produce? 1. aabb 2. CCDdee 3. AABbCcDD 4. MmNnOoPpQq 5. UUVVWWXXYYZz
3 Question #1 Remember the formula 2 n Where n = # of heterozygous 1. aabb = 2 2. CCDdee = 2 3. AABbCcDD = 4 4. MmNnOoPpQq = UUVVWWXXYYZz = 2
4 Question #2 In dogs, wire-haired is due to a dominant gene (W), smooth-haired haired is due to its recessive allele (w). WW, Ww ww = wire haired = smooth haired
5 Question #2A If a homozygous wire-haired dog is mated with a smooth-haired haired dog,, what type of offspring could be produced. W W w w
6 Question #2A W W w Ww Ww F 1 generation w Ww Ww all heterozygous
7 Question #2B What type(s) of offspring could be produced in the F 2 generation? Must breed the F 1 generation to get the F 2. Ww x Ww
8 Question #2B W w W WW Ww F 2 generation w Ww ww genotype: 1:2:1 ratio phenotype: 3:1 ratio
9 Question #2C Two wire-haired dogs are mated. Among the offspring of their first litter is a smooth-haired haired pup. If these, two wire-haired dogs mate again, what are the chances that they will produce another smooth-haired haired pup? What are the chances that the pup will wire- haired?
10 Question #2C W w W WW Ww F 2 generation w Ww ww - 1/4 or 25% chance for smooth-haired haired - 3/4 or 75% chance for wire-haired
11 Question #2D A wire-haired male is mated with a smooth-haired haired female. The mother of the wire-haired male was smooth-haired haired. What are the phenotypes and genotypes of the pups they could produce? Breed: Ww x ww
12 Question #2D W w w Ww ww w Ww ww phenotypes: genotypes: 2:2 ratio 2:2 ratio
13 Question #3 In snapdragons, red flower (R) color is incompletely dominant over white flower (r) color. The heterozygous (Rr) plants have pink flowers. RR Rr rr - red flowers - pink flowers - white flowers
14 Question #3A If a red-flowered plant is crossed with a white- flowered plant,, what are the genotypes and phenotypes of the plants F 1 generation? RR x rr
15 Question #3A R R r Rr Rr F 1 generation r Rr Rr phenotypes: 100% pink genotypes: 100% heterozygous
16 Question #3B What genotypes and phenotypes will be produced in the F 2 generation? Rr x Rr
17 Question #3B R r R RR Rr F 2 generation r Rr rr phenotypes: 1:2:1 ratio genotypes: 1:2:1 ratio
18 Question #3C What kinds of offspring can be produced if a red-flowered plant is crossed with a pink- flowered plant? RR x Rr
19 Question #3C R R R RR RR r Rr Rr 50%: red flowered 50%: pink flowered
20 Question #3D What kind of offspring is/are produced if a pink-flowered plant is crossed with a white- flowered plant? Rr x rr
21 Question #3D R r r Rr rr r Rr rr 50%: white flowered 50%: pink flowered
22 Question #4 In humans, colorblindness (cc) is a recessive sex-linked trait. Remember: XX - female XY - male
23 Question #4A Two normal people have a colorblind son. What are the genotypes of the parents? X C X _? x X C Y What are the genotypes and phenotypes possible among their other children?
24 Question #4A X C Y parents X C X C X C X C Y X c X C X c X c Y 50%: female (one normal, one a carrier) 50%: male (one normal, one colorblind)
25 Question #4B A couple has a colorblind daughter. What are the possible genotypes and phenotypes of the parents and the daughter?
26 Question #4B X c Y X C X C X c X C Y X c X c X c X c Y parents: X c Y and X C X c or X c X c father colorblind mother carrier or colorblind daughter: X c X c - colorblind
27 Question #5 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) are dominant to non- dimpled cheeks (d).
28 Question #5A Two persons with freckles and dimpled cheeks have two children: one has freckles but no dimples and one has dimples but no freckles. What are the genotypes of the parents? Parents: F_D_ x F_D_ F Children: F_dd x ffd_
29 Question #5B What are the possible phenotypes and genotypes of the children that they could produce? Breed: FfDd x FfDd This is a dihybrid cross
30 Question #5B Possible gametes for both: FD Fd fd fd FD Fd fd fd FD FFDD FFDd FfDD FfDd Fd FFDd FFdd FfDd Ffdd fd FfDD FfDd ffdd ffdd fd FfDd Ffdd ffdd ffdd
31 Question #5B Phenotype: Freckles/Dimples: 9 Freckles/no dimples: 3 no freckles/dimples: 3 no freckles/no dimples: 1 Phenotypic ratio will always been 9:3:3:1 for all dihybrid crosses.
32 Question #5B Genotypic ratio: FFDD - 1 FFDd - 2 FFdd - 1 FfDD - 2 FfDd - 4 Ffdd - 2 ffdd - 1 ffdd - 2 ffdd - 1
33 Question #5C What are the chances that they would have a child whom lacks both freckles and dimples? This child will have a genotype of ffdd Answer: 1/16
34 Question #5D A person with freckles and dimples whose mother lacked both freckles and dimples marries a person with freckles but not dimples whose father did not have freckles or dimples. Breed: FfDd x Ffdd Possible gametes: FD Fd fd fd x Fd fd
35 Question #5D What are the chances that they would have a child whom lacks both freckles and dimples? Fd fd FD Fd fd fd FFDd FFdd FfDd Ffdd FfDd Ffdd ffdd ffdd Answer: 1/8
36 Question #6 Sixteen percent of the human population is known to be able to wiggle their ears. This trait is determined to be a recessive gene. These is a population genetics question. Use the following equation: 1 = p 2 + 2pq + q 2
37 Question #6A What of the population is homozygous dominant for this trait? q 2 = 16% or.16: q2 =.16 q =.4 then use: 1 = p + q 1 = p = p p =.6 Now use p 2 for answer:.6 2 =.36 or 36%
38 Question #6B What of the population is heterozygous for this trait? We know that q =.4 and p =.6 Now use 2pq for answer: 2(.6)(.4) (.4) =.48 or 48%
39 Question #7 In dogs, the inheritance of hair color involves a gene B for black hair and gene b for brown hair b. b A dominant C is also involved. It must be present for the color to be synthesized. If this gene is not present, a blond condition results. BB, Bb bb - black hair - brown hair CC, Cc cc - color - blond
40 Question #7A A brown haired male, whose father was a blond,, is mated with a black haired female, whose mother was brown haired and her father was blond. Male: Female: bbcc (gametes: bc bc) BbCc (gametes: BC Bc bc bc) What is the expected ratios of their puppies?
41 Question #7A BC Bc bc bc bc BbCC BbCc bbcc bbcc bc BbCc Bbcc bbcc bbcc Offspring ratios: Black: 3/8 Brown: 3/8 Blond: 2/8 or 1/4
42 Question #8 Henry Anonymous, a film star, was involved in a paternity case. The woman bringing suit had two children, on whose blood type was A and the other whose blood type was B. Her blood type was O,, the same as Henry s! The judge in the case awarded damages to the woman damages to the woman, saying that Henry had to be the father of at least one of the children.
43 Question #8A Obviously, the judge should be sentenced to Biology.. For Henry to have been the father of both children, his blood type would have had to be what? I A I B Answer i I A i I B i i I A i I B i
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