19. If you cross a homozygous dominant individual with a heterozygous individual, what percentage of the offspring would display the dominant phenotype? 1. 0% 2. 25% 3. 50% 4. 75% 5. 100%
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- 18. What would be the expected genotypic ratio in the offspring of a mating between two heterozygotes ? 1. 1 LL: 1II 2. 3 dominant phenotype: 1 recessive phenotype 3. 1 LL: 2LI: 1II 4. 3 LL: 1II20. In crossing two heterozygous parents, what are the chances of producing a heterozygous offspring? 1.0% 2. 25% 3. 50% 4. 75% 5. 100%19. In crossing two heterozygote parents, what are the chances of producing a homozygous recessive offspring? 1. 0% 2. 25% 3. 50% 4. 75% 5. 100%
- 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci? answers: 81/256 81/128 27/256 3/1618. The following question refers to the pedigree chart in the figure below for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the likelihood that the progeny of IV-3 and IV-4 will have the trait? (LS3-3) * 1 2 I ww Ww 2 3 4 8 II O III 2 3 4 IV 0% 50% 75% 100%15. Determine the probability of producing a child with the dominant phenotype given a cross between a homozygous dominant and a heterozygous? 1. 0% 2. 25% 3. 50% 4. 75% 5. 100%
- 1. How many different types of gametes can be produced by an individual with the genotype Yy Ww Pp ee Bb? 2. If an individual with the genotype Yy Ww Pp ee Bb is crossed with another individual with the same genotype, what proportion of offspring will be homozygous recessive at all genes? 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci?21. Turkeys have black, bronze, or black-bronze plumage. Examine the results of the following crosses: Parents Offspring Cross 1: black and bronze all black Cross 2: black and black 34 black, 1/4 bronze Cross 3: black-bronze and all black-bronze black-bronze Cross 4: black and bronze 2 black, 1/4 bronze, ¼ black-bronze Cross 5: bronze and black- 2 bronze, 1/2 black- bronze bronze Cross 6: bronze and 34 bronze, 14 black- bronze bronze Do you think these differences in plumage arise from incomplete dominance between two alleles at a single locus? If yes, support your conclusion by assigning symbols to each allele and providing genotypes for all turkeys in the crosses. If your answer is no, provide an alternative explanation and assign genotypes to all turkeys in the crosses.3. Set up a Punnett square using the following information: Dominate allele for normal coat color in wolves = N Recessive allele for black coat color in wolves = n Dominant allele for brown eyes = B Recessive allele for blue eyes = b Cross a heterozygous dominant parent with a homozygous recessive parent. Using the Punnett square above: a. What is the probability of producing a wolf with a normal coat color with brown eyes? Possible genotype(s)? b. What is the probability of producing a wolf with a normal coat color with blue eyes? Possible genotype(s)? c.What is the probability of producing a wolf with a black coat with brown eyes? Possible genotype(s)? d. What is the probability of producing a wolf with a black coat with blue eyes? Possible genotype(s)?
- 7. In pea plants, inflated pod is governed by a completely dominant gene and a constricted pod by a recessive gene. Another independently segregating dominant gene produces green pod while recessive gene produces yellow pod. Give the genotypes of the parents in each of the crosses given below. Phenotypes of Offspring Parental Phenotypes Parental genotypes Inflated Inflated Constricted Constricted yellow green yellow Green inflated green x inflated yellow 7.1. 58 62 18 22 7.2. constricted green x 56 18 constricted green 7.3 inflated yellow x 64 20 inflated yellow inflated green x inflated yellow 7.4. 36 38 inflated green x inflated green 7.5. 178 62 58 223. Set up a Punnett square using the following information: Dominate allele for purple corn kernels = R Recessive allele for yellow corn kernels =r Dominate allele for starchy kernels = T Recessive allele for sweet kernals =t Cross a homozygous dominant parent with a heterozygous parent. Using the Punnett square above: a. What is the probability of producing purple, starchy corn kernels? Possible genotype(s)? b. What is the probability of producing yellow, starchy corn kernels? Possible genotype(s)? c.What is the probability of producing purple, sweet corn kernels? Possible genotype(s)? d. What is the probability of producing yellow, sweet corn kernels? Possible genotype(s)?4. Genetically, pure white dogs, when crossed to brown dogs produce an all white F1. Data on F2 progeny reveals: 136 white; 41 black; and 13 brown. This coat color trait in dogs is said to be exhibiting dominant epistasis following a 12: 3: 1 expected ratio. Test this hypothesis by chi square. Values of Chi Square dF .500 995 .oʻ393 990 975 .0³157 .0982 .0°393 .950 .900 .750 250 .100 .050 1 .0158 .102 .455 1.32 2.71 3.84 2 .0100 .0201 .0506 .103 .211 .575 1.39 2.77 4.61 5.99 .0717 .115 .216 .352 .584 1.21 2.37 4.11 6.25 7.81 4 .207 .297 .484 .711 1.06 1.92 3.36 5.39 7.78 9.49 5 .412 .554 .831 1.15 1.61 2.67 4.35 6.63 9.24 11.1