1.)The frequency of the R allele for round seeds in a certain population of 500 peas was found to be 0.45. How many of them were wrinkled? How many of them had the rr genotype? How many of them were round?
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1.)The frequency of the R allele for round seeds in a certain population of 500 peas was
found to be 0.45.
How many of them were wrinkled?
How many of them had the rr genotype?
How many of them were round?
2.)In humans, a dominant allele controls the formation of a cleft chin, a Y-shaped fissure
in the chin caused by an atypical bone formation in the mandible (this phenotype
is also known as a chin dimple). A survey of 1200 college students found that
108 of them did not have a cleft chin. What was the frequency of heterozygotes in
that student population?
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- In a large, randomly mating population, the frequency of the allele (s)for sickle-cell hemoglobin is 0.028. The results of studies have shownthat people with the following genotypes at the beta-chain locus producethe following average numbers of offspring:Genotype Average numberof offspring producedSS 5Ss 6ss 0a. What will the frequency of the sickle-cell allele (s) be in the nextgeneration?b. What will the frequency of the sickle-cell allele be at equilibrium?Color blindness in humans is an X-linked recessive trait. Approximately10% of the men in a particular population are color blind.a. If mating is random with respect to the color-blindness locus, what isthe frequency of the color-blindness allele in this population?b. What proportion of the women in this population are expected to becolor blind?c. What proportion of the women in this population are expected to beheterozygous carriers of the color-blindness allele?Nieman-Pick Syndrome involves a defective enzyme, sphyngomylinase. It is usually fatal before the age of 3. The defective allele frequency is 0.01 in Ashkenazi populations. Let’s call the healthy allele A, and the lethal allele a. a) What is the frequency of allele A? Assuming Hardy-Weinberg equilibrium, how many people do you expect to have the three genotypes in a population of 10,000? b) AA:_______ c) Aa:________ d) aa:_________