Problem #1 In some chickens, the gene that produces color shows incomplete dominance. The gene will produce either a black (B) chicken, a white (W) chicken, or a gray (BW) chicken. Identify the genotype and phenotype ratios of a cross between a black and a gray chicken. P Genotypic Ratio: I 1 I | Phenotypic Ratio: I
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- Problem 5. The eye color of fruit flies is an X-linked trait. The red eye color is dominant and the white eye color is recessive. If a white-eyed male fly mates with a heterozygous red-eyed female fly, what will be the genotypes and phenotypes of their offspring? a) Construct a Punnett Square - List gametes in the area with the dashed line and the genotypes of the offspring in the area with the sold line. b) Genotypes of Offspring- c) Phenotypes of Offspring-PROBLEM 1. In a certain plant, yellow fruit, Y, is dominant to white fruit, y. A heterozygous plant with yellow fruit is crossed with a plant with white fruit. Determine the probable genotypic and phenotypic ratios resulting from this cross. Determine the probable genotypic and phenotypic ratios expected from crossing two heterozygous plants of Problem 1. Show your complete solutions (Punnet square)Problem 3: In snapdragons, the inheritance of flower color and size of leaves are examples of Incomplete Dominance. When red flowered plants are crossed with white, the offspring have pink flowers. Similarly, when a plant with broad leaves is crossed with plants having narrow leaves, the offspring have intermediate leaves. Regarding a cross between a homozygous red-flowered, broad- leaved plant with a homozygous white-flowered, narrow-leaved plant. What are the phenotypes and their ratio in the F1 generation? Construct a Punnett square. What are the phenotypes and their ratio in the F2 generation? Construct a Punnett square.
- Problem 1. Tallness is a dominant trait and shortness is a recessive trait in a pea plant species. If you cross two heterozygous plants, what will be the genotypes and phenotypes of the offspring? What will be the genotypic and phenotypic ratios? a) Construct a Punnett Square - List gametes in the area with the dashed line and the genotypes of the offspring in the area with the sold line. b) Genotypes of Offspring- c) Phenotypes of Offspring- d) Genotypic Ratio of Offspring- e) Phenotypic Ratio of Offspring-Unpacking Problem 731. Define homozygous, mutation, allele, closely linked, recessive, wild type, crossing over, nondisjunction, testcross, phenotype, and genotype.2. Does this problem concern sex linkage? Explain.3. How many chromosomes does Drosophila have?4. Draw a clear pedigree summarizing the results of crosses1, 2, and 3.5. Draw the gametes produced by both parents in cross 1.6. Draw the chromosome 4 constitution of the progeny ofcross 1.7. Is it surprising that the progeny of cross 1 are wild-typephenotype? What does this outcome tell you?8. Draw the chromosome 4 constitution of the male testerused in cross 2 and the gametes that he can produce.9. With respect to chromosome 4, what gametes can thefemale parent in cross 2 produce in the absence of nondisjunction? Which would be common and which rare?10. Draw first- and second-division meiotic nondisjunctionin the female parent of cross 2, as well as in the resultinggametes.11. Are any of the gametes from part 10 aneuploid?12.…Problem 4: In Andalusian fowls, the heterozygous condition for the alleles of black plumage and white plumage is blue plumage. What offspring will a blue Andalusian rooster have if bred to birds of the following plumage: black plumage blue plumage white plumage Diagram the three crosses. List the probability of each of the three types of plumage occurring.
- Problem 3) Butterflies show 3 phenotypes due to incomplete dominance at the D locus with alleles DY and DB giving green phenotype in heterozygotes and yellow and blue in homozygotes a) A population of butterflies showed 49% yellow, and 51% blue and green. What percentage of the gametes for the next generation would contain the DB allele? b) In another population only 1% of the butterflies are blue, What is the DY allele frequency? c) If the butterflies were subject to predation by birds that could easily detect blue & yellow individuals what effect would you expect this to have on the genotype and allele frequencies over time? Indicate possible percentages.Subject: Genetic problems 6. how would you recognize a line of garden peas that had become genotypically pure for a given trait? 7. A cross of two pink-flowered plants produces offspring whose flowers are red, pink, or white. Defining your genetic symbols, give all the different kinds of genotypes involved, and the phenotypes they represent. 9. In snapdragons, red flowers (R) are incompletely dominant to white (r), the hybrid being pink; narrow leaves (N) are incompletely dominant to broad leaves (n), the hybrid being intermediate in width ("medium"). show the genotypes and phenotypes for the progeny of a cross between a. red medium and pink medium plant b. a pink medium and white narrow c. two identical dihybrids 12. In guinea pigs, short is dominant to long. A short-haired guinea pig was mated to a long-haired one. What proportions of the offspring (F1) will be expected to be: a. homozygous short-haired b. homozygous long -haired c. heterozygous short-haired d. heterozygous…Problem 4) About 7% of men in a population are red-green colour blind due to a sex-linked recessive gene. Assuming random mating in the population with respect to colour blindness; a) What percentage of women would be expected to be colour blind? b) What percentage of women would be expected to be heterozygous? c) What percentage of men would be colour blind in the next generation?
- Problem 2) Skin colour in dolphins is determined by a single gene showing incomplete dominance giving rise to 3 phenotypes Brown, Pink & White. A survey of a large population of dolphins was carried out and the phenotypes recorded. However a student who had some of the data stored on their phone fell overboard and unfortunately the data was lost. The only data saved was that the brown homozygous dominants (BB) were 64% of the population . a) What would be the percentage of pink heterozygotes and white homozygotes?Problem: A homozygous tall, homozygous white flower plant crosses with a homozygous short, homozygous purple flower plant. We know that the purple and tall flowers are the dominant traits. Show your work. 1. What are the genotypes of the offspring? Why? 2. What are the genotypes of the offspring? Why?Problem 1: A pet storeowner mated two guinea pigs with the following results 22 black offspring 5 white offspring He then mated two of the black offspring and got the following results: 16 black offspring 3 white offspring What is the genotype of the parents used in the first cross? What is the genotype of the parents used in the second cross? What is the chance of obtaining a totally homozygous offspring in the second cross? If the white offspring were crossed with the original parents, what would be the probability of obtaining white offspring? What would be the chance of obtaining a homozygous black offspring?