9) You measure MN blood types among your genetics classmates. You find that 70 i
ID: 199785 • Letter: 9
Question
9) You measure MN blood types among your genetics classmates. You find that 70 individuals are MM.110 are MN, and 20 are NN. What is the expected frequency of the MM genotype under Hardy Weinberg Equilibrium? a) 0.500b) 0.836 c) 0.700 0.625 e) 0.391 101 200 10) Which of the following is part of the transposable element life cycle? a) horizontal transfer to another species b) rapid increase in copy number c) gradual loss of functional elements through mutation d) gradual reduction in transposition rate e) all of the above 11) In Drosophila, the eye color peach is determined by an autosomal recessive allele p (the normal eye color is red). On a different chromosome, the autosomal recessive allele s suppresses peach, restoring the red eye color. When two homozygous red strains A and B are crossed to each other, the Fi is red. But when the Fi is backcrossed to strain A, the phenotypic ratio of the offspring is 3/4 red and 1/4 peach flies. The genotype of strain A is best represented as: 12) What enables us to determine the genetic basis of a quantitative trait? a) offspring have half of their genome in common with each parent b) quantitative phenotypes have a normal distribution c) most individuals are heterozygous at multiple loci d) every offspring has two parents e) quantitative traits often show continuous rather than discrete variation 13) In corn, R is a gene for red aleurone; its recessive allele r determines colorless aleurone. A cross is made between a diploid r/r female and a trisomic R/t/r male. If trisomic pollen grains are inviable, what is the expected ratio of red to colorless kernels in the offspring? a) 1 red: 1 colorless b) 1 red: 2 colorless c) 1 red: 3 colorless d) 1 red: 5 colorless e) none of the above 14) In chickens, the creeper phenotype is characterized by extremely short legs. It is also impossible to develop a pure-breeding strain of creepers. The allele responsible for the creeper phenotype is best described as: a) lethal recessive b) haplosufficient c) incompletely dominant d) dominant negative e) haploinsufficientExplanation / Answer
9. Calculating the allele frequencies for M and N.
F(M) = 2*(#of MM) +(# of MN)/2* (total number of individuals)
freq(M) = 2*(70) + 110/2* (70+110+20)= 140+110/2* 200)= 0.625
freq(N) = 1 - freq(M) = 1 - 0.625 = 0. 375
Calculation frequency of MM genotype
freq(MM) = 0.625*0.625 = 0.391
Right option is e. 0.391
10. Transposable elements increase in copy number after their life cycle as the element is inserted in multiple copies in the genome. Transposons can be transferred from one species to another by horizontal transfer. This horizontal transfer is an essential step in life cycle of transposable element. Transposon cycle leads to either creation or removal of mutation in the DNA. There may be loss of copies of genes due to deletion, which increase the mutation rate. As copy numbers increase, the transposition rate decreases.
Right option is e. all of the above
As per Chegg’s rules, only one question needs to be answered.
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