a. Black (B) fur color in mice is dominant over white (b) fur color. Draw a Punnett square for a cross between a true-breeding mouse with black fur and a true-breeding mouse with white fur. b. What are the genotypes found in the F1 generation? c. Two individuals from the F1 generation are crossed to produce the F2 generation. What are the phenotypes observed in the F2 generation? 3. Consider the following alleles in corn: the allele for kernel size can be giant (G) or dwarf (g) and the allele for kernel color can be purple (P) or yellow (p). For each question, be sure to show your logic or work. a. Write all the genotypes possible for the gametes of a plant that is heterozygous for both traits. b. What is the probability of a GgPp parent producing a gP gamete? c. In a cross between GgPp individuals, what is the probability of an offspring with the GGPp genotype? d. What is the probability of a giant, yellow phenotype being produced in a cross of GgPp plants? e. 2234 plants are produced in the cross - how many plants are dwarf and purple?
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Question 1: In a type of mouse, fur color is determined by alleles at one gene locus; allele A for black fur and allele a for white. Height is determined by another gene locus; allele B for tall and allele b for short. Each upper case allele is completely dominant to their respective lower case allele. The 2 gene loci sort or segregate independently. There are no interactions. Mouse 1 (genotype AaBb) mates with mouse 2 (genotype AaBb) and they produce 150 offspring. a) What are the genotypes of the gametes produced by mouse 1? b) How many phenotypic classes are expected in the offspring? c) What is the expected ratio among the phenotypic classes (give the ratio and classes)? d) How many of the 150 offspring are expected to have tall height? e) What fraction of the offspring is expected to be homozygous for the recessive allele at both loci? f) How many offspring are expected to be homozygous for black fur and tall height? g) If mouse 1 mated with another mouse, genotype aabb, what is the expected ratio among the phenotypic classes in the progeny? Do not list the classes; only the ratio is requested. h) If mouse 1 mated with another mouse, genotype aabb, what fraction of the progeny would you expect to have the combination black fur and tall?
Madhur L.
In certain flowers, yellow (YY) is dominant over white (yy). Show a Punnett square for (A) the F1 generation of a cross between yellow and white flowers. (B) What is/are the genotype(s)? (C) Show a square for the cross of the results of the F1. (D) What is the phenotype for this cross? (E) What is the genotype? What are the ratios for (D) and (E)? 2. For flower height and color, tall (TT) is dominant over short (tt) and yellow (YY) is dominant over white (yy). Show dihybrid squares for the following: heterozygous tall and yellow, with homozygous tall and homozygous white. (A) What are the phenotypic ratios? (B) What are the genotypic ratios? 3. Black mice (BB) color is incompletely dominant over gray (Bb) and (bb) is white. Show a square for the following match: Black and gray. (A) What phenotypic ratio would you get? (B) What genotypic ratio would you get? 4. If a mother is homozygous AA blood, and a father has heterozygous BO blood, what are the possible blood types of the offspring? 5. What if the mother is heterozygous A and the father is heterozygous B? 6. A normal female, who is a carrier for hemophilia, marries a man who does not have hemophilia. What are the possibilities for their children? Could they have a girl who has hemophilia?
Bryan V.
12. Red-flowering snapdragons are homozygous for allele $R^{1}$. White-flowering snapdragons are homozygous for a different allele $\left(R^{2}\right)$. Heterozygous plants $\left(R^{1} R^{2}\right)$ bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. $R^{1} R^{1} \times R^{1} R^{2}$ b. $R^{1} R^{1} \times R^{2} R^{2}$ c. $R^{1} R^{2} \times R^{1} R^{2}$ d. $R^{1} R^{2} \times R^{2} R^{2}$ (In cases of incomplete dominance, alleles are usually designated by superscript numerals, as shown here, not by the uppercase letters for dominance and lowercase letters for recessiveness.
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