What genotypes would be expected for the offspring from the following matings? What are the phenotypic ratios for each cross? Explain how you came up with this ratio? а. AАB х аaBB b. AаBB x АABЬ c. AaBb x aabb d. AaBb x AaBb
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Please answer a and b and explain how you came up with the ratio?
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- Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?The genotype of F1 individuals in a tetrahybrid cross isAaBbCcDd. Assuming independent assortment of these fourgenes, what are the probabilities that F2 offspring will have thefollowing genotypes?(a) aabbccdd(b) AaBbCcDd(c) AABBCCDD (d) AaBBccDd(e) AaBBCCddFor the mating AaBBDdGg x AabbDdGG, draw the monhybrid punnet squares, one for each of the four genes shown in the cross. Assume that all genes assort independently. What fraction of the offspring would have the phenotype A_B_D_G? What fraction of the offspring would have the phenotype aaB_ddG_?
- Fruit flies can have straight wings (S) or curly wings (s), and they can have be female XX or male XY. (A) For a standard monohybrid cross (Ss ´ Ss), what proportion of the offspring will have the genotype ss? (Express the proportion as a simple fraction) (B) For the following cross (SsXX ´ SsXY), what proportion of the offspring will have the genotype Ss? (Express the proportion as a simple fraction) (C) What proportion will have the genotype XX? (Express the proportion as a simple fraction) (D) What proportion will have the genotype SsXX? (Express the proportion as a simple fraction)SHOW YOUR WORKAn orange [YR] snap dragon is a result of a cross between a yellow [YY] snap dragon and a red [RR] snap dragon where yellow is incompletely dominant over red. Using a Punnet square, show the cross between a yellow and an orange snap dragons? Find the genotypic and phenotypic of the offspring and it's ratio.Use the product rule to determine the chance of obtaining an offspringwith the genotype Rr Yy from a dihybrid cross between parents withthe genotype Rr Yy.a. ½ c. 1/4b. ¼ d. 1⁄16
- please asnwer asap The following are the offspring produced by the cross of AaBBCc X AaBbCC, except: a. AABBCC b. AabbCc c. AaBbCC d. AaBBCcThe genotype of F1 individuals in a tetrahybrid cross isAaBbCcDd. Assuming independent assortment of these fourgenes, what are the probabilities that F2 offspring will have thefollowing genotypes?(a) aabbccdd(b) AaBbCcDd(c) AABBCCDDMost of the feathers of erminette fowl are light colored, with an occasional black one, giving a fleckedappearance. A cross of two erminettes produced a totalof 48 progeny, consisting of 22 erminettes, 14 blacks,and 12 pure whites. What genetic basis of the erminette pattern is suggested? How would you test yourhypotheses?
- A geneticist crosses two yellow mice with straight hair and obtains the following progeny: 12 yellow, straight 16 yellow, fuzzy 14 gray, straight 112 gray, fuzzya. Provide a genetic explanation for the results and assign genotypes to theparents and progeny of this cross.b. What additional crosses might be carried out to determine if yourexplanation is correct?Write the number of different kinds of phenotypes,excluding sex, you would see among a large numberof progeny from an F1 mating between individuals ofidentical genotype that are heterozygous for one ortwo genes (that is, Aa or Aa Bb) as indicated. No geneinteractions means that the phenotype determined byone gene is not influenced by the genotype of theother gene.a. One gene; A completely dominant to a.b. One gene; A and a codominant.c. One gene; A incompletely dominant to a.d. Two unlinked genes; no gene interactions; Acompletely dominant to a, and B completelydominant to b.e. Two genes, 10 m.u. apart; no gene interactions; Acompletely dominant to a, and B completely dominant to b.f. Two unlinked genes; no gene interactions; A anda codominant, and B incompletely dominant to b.g. Two genes, 10 m.u. apart; A completely dominantto a, and B completely dominant to b; and withrecessive epistasis between aa and the alleles ofgene B.h. Two unlinked duplicated genes (that is, A and Bperform…In a trihybrid cross involving three traits where the parents are AaBbCc. (a) What is the probability of them producing an offspring recessive for all three traits? (b) What is the probability of offspring with phenotype A_bbc_?
