Question

Plase hlp answer these questions:

White wool in sheep is controlled by a dominant allele R, and black wool by the recessive allele r. In an isolated population of 6530 sheep, 514 are black, 4981 are heterozygous, 1035 are homozygous white. When will this population be expected to reach Hardy-Weinberg equilibrium? in the next generation in two generations it already is in equilibrium impossible to tell it will not reach equilibrium A population has the following genotypic distributions: A^M A^M = 1787, A^M A Degree = 2011 , A Degree A Degree = 2331. Is this population at H-W equilibrium ? yes, with allele frequencies of p = 0.45562 and q = 0.54437 yes, with allele frequencies of p = 0.54437 and q = 0.37862 no, with allele frequencies of p = 0.45562 and q = 0.37862 no, with expected genotypic ratios of p^2 = 1272, 2pq = 3040, and q^2 = 1826 yes, with expected genotypic frequencies of p^2 = 1778, 2pq = 2015, and q^2 = 2336 Which statement best applies to the phenomenon of genetic drift ? the smaller the population size, the greater the effects of drift the smaller the population size, the lesser the effects of drift the effects of genetic drift are greatest in either very small or very large populations the effects of genetic drift are greatest in populations that are neither very small nor very large the effects of genetic drift are the same regardless of population size Most of the genetic variation observed in sexually-reproducing natural populations arises from: random mutational events in the germ cells genetic drift recombination of alleles at meiosis actions of mutagenic agents natural selection Ultraviolet radiation can cause: depurination deamination thymine dimmers thymine dimers and breaks in phosphodiester bonds oxidation of nucleotides Sunburns can lead to skin cancer because: the excison repair system is sometimes non-functional increasing excision repair increases the probability that an incorrect nucleotide gets inserted over-exposure to UV light can break DNA strands, leading to mutations cell proliferation is increased, leading to mistakes all of the above

Answer 1

69. d. Impossible to tell

70. The correct option is (E)

71. a. the smaller the population size, the greater the effects of drift.

72. c. recombination of alleles at meiosis

73. c. thymine dimers

74. c. over-exposure to UV light can break DNA strands, leading to mutations.