Q6.6. If gametes from a gene pool combine randomly to make only a small number of zygotes, the allele frequencies among the zygotes may be quite different than they are in the gene pool. Why? The effects of natural selection are more pronounced in small populations. Changes in allele frequencies over many generations are inevitable with sexual reproduction. Alleles combine more randomly with a small number of zygotes. The effects of sampling error are more pronounced with smaller samples.
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- Q5.1. Which of the following is FALSE? O If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbAlHbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. O In regions where malaria does not occur, individuals who are heterozygous HbAIHbS have a fitness advantage over those who are homozygous for the normal hemoglobin allele (HbA).Q5.1. Which of the following is FALSE? If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/ HbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. OIn regions where malaria does not occur, individuals who are heterozygous HBAIHBS have a fitness advantage over those who are homozygous for the normal hemoglobin allele (HbA). Submit Q5.2. AFTER malaria is cured, the frequency of the HbS allele should decrease in regions with lots of mosquitoes because: People will no longer die from sickle-cell disease in these regions. Having one copy of the HbS allele will no longer be advantageous in these…Q5. Which of the following is FALSE? If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/HbS are protected from malaria, and this is why sickle-cell anemia persists in wetter, mosquito-prone regions in Africa. O In regions where malaria does not occur, individuals who are heterozygous HbA/HbS have a selective advantage over those who are homozygous for the normal hemoglobin allele (HbA).
- Q4.7. A large sunflower population is established in a field. The flowers mate randomly, and all individuals are equally likely to survive and reproduce. In this population, 60% of the alleles of a gene for petal color are dominant and 40% of the alleles are recessive. Given this information, after many generations, which of the following options would be most likely? The allele frequencies will be 100% dominant and 0% recessive. The allele frequencies will be 80% dominant and 20% recessive. The allele frequencies will be 60% dominant and 40% recessive. There is no way to predict what the allele frequencies will be.#4: Ch. 20- Hardy-Weinberg The ApoE gene has three common alleles: E2, E3 and E4. A population survey of Reno reveals the following frequencies: 0.10 for E2, 0.15 for E3, 0.75 for E4. Assume random mating is occurring. If the E4 allele confers resistance to hepatitis C (when 1 or 2 copies are present), what proportion of the population is NOT resistant to hepatitis C? Kidd S'07Q2. The table shows concordance for height between monozygotic and dizygotic twin pairs from birth to the age of eight years. A concordance of 1 indicates that the twins are identical in height Concordance for height between Age monozygotic twin pairs dizygotic twin pairs of the same sex Birth 3 months 6 months 12 months 24 months 0.62 0.78 0.80 0.86 0.89 0.93 0.94 0.94 0.79 0.72 0.67 0.66 0.54 0.56 0.51 0.49 3 years 5 years 8 years (a) If heightwere entirely genetically controlled, what concordance would you expect between monozygotic twin pairs? Explain your answer. Does data for eight-year-old twins suggest that heightis largely controlled by genetic factors? Explain you answer. (b) (c) Suggest an explanation for the low concordance at birth for monozygotic twins.
- Q6.8. Imagine a population evolving by genetic drift, in which the frequency of allele K is 0.3. What is the probability that at some point in the future allele K will drift to a frequency of 1.0? Express your answer as a number between 0 and 1. (Hint: Remember the exercise you did in Section 3 - Size Matters, where you explored how the probability of fixation is dependent on an allele's initial frequency.)Thank youif gametes from a gene pool combine randomly to make only a small number of zygotes, the allele frequencies among the zygotes may be quite different than they are in the gene pool, why? (choose one from below) 1. the effects of natural selection are more pronounced in small populations 2.changed in allele frequencies over many generations are inevitable with sexual reproduction 3. alleles combine more randomly with a small number of zygotes 4. the effects of sampling error are more pronounced with smaller samples
- 24. In a toad population, green toads produce 4 offspring over their lifetime, brown toads produce 2.5 offspring, and gray toads produce 6 offspring. What are the relative fitnesses of these phenotypes (in the order green, brown, gray)? Group of answer choices 1, 0.42, 0.67 0.33, 1, 0.67 0.67, 0.42, 1 0.67, 0.33, 1 1, 0.33, 0.67Why are polyandrous mating systems more rare than polygynous matings? Only males are capable of multiple rounds of reproduction within a single breeding season Only females care for the young Females usually experience more intrasexual selection pressure than males Females usually devote more energy to offspring production and development.If the genotype frequencies in a population are 0.60 AA, 0.20 Aa, and 0.20 aa, and if the requirements of the HardyWeinberg principle apply, the genotype frequencies in the offspring generation will be: a. 0.60 AA, 0.20 Aa, 0.20 aa. b. 0.36 AA, 0.60 Aa, 0.04 aa. c. 0.49 AA, 0.42 Aa, 0.09 aa. d. 0.70 AA, 0.00 Aa, 0.30 aa. e. 0.64 AA, 0.32 Aa, 0.04 aa.