Scenario: Most goats have smooth necks due to single-gene inheritance and being homozygous for the W^(0). Some goats have a pair of neck wattles and are homozygous for the W^(2) allele, while a few have only one wattle (W^(0)W^(2)). Use this scenario to answer the following questions: What mode of dominance is evident? a. complete b. partial How many phenotypes for wattle number are possible in goats? a. 0 b. 1 c. 3 Which scenario would only increase the amount of genetic diversity in the population for the presence of wattles? a. genetic drift b. migration c. mutation d. selection When are Mendel's rules in action with regard to wattle allele segregation in goats? a. selection b. gametogenesis c. mating d. fertilization Scenario: Most goats have smooth necks due to single-gene inheritance and being homozygous for the W^(0). Some goats have a pair of neck wattles and are homozygous for the W^(2) allele, while a few have only one wattle (W^(0)W^(2)). Use this scenario to answer the following questions: 1. What mode of dominance is evident? a. complete b. partial c. co-dominance 2. How many phenotypes for wattle number are possible in goats? a. 0 b. 1 c. 3 3. Which scenario would only increase the amount of genetic diversity in the population for the presence of wattles? a. genetic drift b. migration c. mutation d. selection 4. When are Mendel's rules in action with regard to wattle allele segregation in goats? a. selection b. gametogenesis c. mating d. fertilization
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This is because the phenotype of having one wattle (W^(0)W^(2)) is intermediate between the phenotypes of having no wattles (W^(0)) and having two wattles (W^(2)). Show more…
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1. What are the possible genotypes and phenotypes of the offspring of a pea plant with yellow seeds (heterozygous) and a pea plant with green seeds? Give the probabilities for each possibility. [3 points] 2. What are the possible phenotypes of the offspring of a short pea plant with axial flowers (heterozygous) and a tall pea plant (heterozygous) with terminal flowers? If 100 pea plants are produced, how many would have each of the possible phenotypes? [2 points] 3. Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a alleles. AA or Aa results in agouti color, while aa results in black coats. What F1 and F2 phenotypic ratios are obtained from a cross between AACC and aacc mice? What phenomenon is demonstrated in this problem? [4 points] 4. The ruffed chicken has an under-chin wattle. A smooth wattle (S) is dominant over a wrinkled wattle (s). A red wattle (HR) is incompletely dominant with a white wattle (HW) so that an individual with HRHW will have a pink wattle. A chicken with a wrinkled red wattle is mated to a homozygous chicken with a smooth white wattle. What is the genotype and phenotype of the chicks? [4 points]
Sri K.
44. Why don't similar genotypes always produce the same phenotype? A. Parents alter their phenotype and pass on this phenotype to progeny. B. Phenotype is the product of many environmental influences. C. Genetic variations of ADH enzyme produce the same phenotype. D. Animals display different phenotypes dependent on diet, not genotype. 46. Which of the following attributes has the least effect on the contribution an individual makes to the gene pool of the next generation? A. Spas of mating privileges. B. More efficient at obtaining food. C. Produces more offspring. D. Camouflage from predators. 47. "Until the agricultural evolution 10,000 years ago, people used to live in small populations with little gene flow between them. That is the best situation for rapid evolution," said Sewall Wright, one of the founders of population genetics. This conclusion on gene flow conflicts with Hardy-Weinberg equilibrium, which states that no gene flow means: A. Natural selection. B. No evolution. C. No random mating. D. No genetic drift. 58. Larval flies (maggots) express the Ubx gene in all of their segments, and thereby lack appendages. If this same gene continued to be expressed throughout subsequent developmental stages, except in the head region, and if the result was a fit, sexually mature organism that still strongly resembled a maggot, this would be an example of: A. Homochrony. B. Exaptation. C. Paedomorphosis. D. Adaptive radiation.
Adi S.
1. How many unique gametes can organisms with each of the following genotypes produce? RrBb, RRbb, RrBB, rrbb, AaBbRr, AabbRr AABBRrDD 2. In genetics experiments with garden peas, a plant with purple flowers and smooth pods is crossed with a plant that has white flowers and constricted pods. All of the offspring of this cross have purple flowers and smooth pods. a. What does this tell you about the purple/smooth alleles? b. What were the genotypes of your original plants? c. What are the genotypes of the offspring of this cross (F1)? d. What genotypes are possible in the gametes produced by the F1? e. What phenotypic ratio would you expect for the F2 generation? Draw a Punnett square to support your answer. 3. If, for a particular species of plant, blue flowers are dominant over white, and multiple petals are dominant over single petals, give the expected genotypic and phenotypic ratio of the following crosses: a. white multiple (homozygous) x blue (heterozygous) single b. white single x blue (homozygous) multiple (heterozygous) c. white single x white single 4. What is the probability that each of the following pairs of parents will produce the indicated offspring (assuming independent assortment of all gene pairs)? a. AA x aa ---> Aa b. Aa x aa ---> Aa c. AaBb x aabb ---> AaBb d. AABBCC x aabbcc ---> AaBbCc e. AABbCc x AaBbCc ---> AABbCC f. AaBbCc x AaBbCc ---> AaBbCc g. aaBbCC x AABbcc ---> AaBbCc 5. In dogs, dark coat color is dominant over albino, and short hair is dominant over long hair. If these effects are caused by two independently segregating genes, write the most probable genotypes for the parents of each of the following crosses, using the symbol C and c for coat-color alleles and H and h for short and long hair alleles. Phenotypes of offspring Parental Phenotypes Dark Short Dark Long Albino Short Albino Long a) dark short x dark short 89 31 29 11 b) dark short x dark long 18 19 0 0 c) dark short x albino short 20 0 21 0 d) albino short x albino short 0 0 28 9 e) dark long x dark long 0 32 0 10 f) dark short x dark short 46 16 0 0
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