ty ol ndividuals that are heterozygous for this allele? 8 B) 0.36 81 ollowing pa
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ty ol ndividuals that are heterozygous for this allele? 8 B) 0.36 81 ollowing paragraph for questions 7&8 ear 251 la galaxy. The colonists and their offspring randomly mate for generations. All ten of the original colonists had bes and two were heterozygous for this trait. The allele for free earlobes is dominant to the allele for attached 6, ten unrelated space colonists (5 male and 5 female) settle on an uninhabited earthlike planet in the of the following ratios is likely to be closest to the allele frequency of the founding population? 0.2 a, 0.8 A 0.8 a, 0.2A 0.1 a, 0.9 A 0.9 a, 0.1 A of the original colonists died before they produced offspring, the ratios of genotypes could be quite different in uent generations, this would represent: A) gene flow B) genetic drift C) disruptive selection D) stabilizing selection 9.) A researcher propagated a small population of Caenorhabditis elegans (a species of round worm) in a laboratory by choosing only a few worms from every generation to produce offspring. The researcher observed that the survivability of the worms decreased significantly after several generations. Which of the following is the best method for increasing the survivability of the worms in the experimental population? A) Further reduce the number of worms transferred from each generation B) Increase the number of worms that are transferred from each generation. C) Introduce genetic variation into the worm population by breeding them with a different strain of C. elegans. D) Expose the worms to a mutagen to increase their mutation rate. 10.) Among Pacific coho salmon (Oncorhynchus kisutch), there are two genetically determined types of male fish. One kind of male is much smaller than the other (called a "jack"), resembles a female, cannot fight, and sneaks into larger fearsome-looking "hooknose" male's nests to fertilize the female's eggs. When "jacks" are rare, they have a selective advantage over the "hooknose" males which develop hooked jaws and enlarged teeth. However, if there are too many "jacks", "hooknose" males switch to a more aggressive strategy of nest defense and the "jacks" lose their advantage. Which type of selection listed below best describes what is happening here? A) Disruptive selection B) Directional selection C) Stabilizing selection D) Frequency-dependent selection 11.) You discover a population of a rare lizard species in the Brazilian jungle. You remove several individuals from this population and upon these results, which is the best conclusion: take them back to your lab for genetic testing. You discover that their genetic diversity is very low. Based A) Population may be the result of founder effect B) Population may be the result of bottleneck effect C) Population may be the resut of inbreeding D) Insufficient data to conclude A, B, or C was specifically responsible. ilizing diploid eggs from one salamander species with 12.) Researchers produc diploid sperm also tetraploids. Which of the fo the wild? from a second species. When the hybrid salamanders were mated with each other, the viable offspring were llowing best describes the consequences if the tetraploid salamanders were released into A) The two parent species would interbreed with the tetraploids and all three would fuse into one species B) The two parent species would suddenly recognize each other and the tetraploids as mates C) The tetraploids do not produce viable offspring from mating with either parent species. D) The tetraploids would be selected against.Explanation / Answer
9) Answer- C
Introducing genetic variations will help worms to survive better in a changing environment.
10) Answer- D
Frequency depended selection rely on the relative number of one kind of member over the other kind. It is a negative frequency-dependent selection. As the frequency of the species increases its survival chance decreases.
11) Answer- D
Bottleneck effect, Founder effect, and inbreeding reduce the genetic variability of the population.
12) Answer- C
Tetraploid are progenies are viable. Crossing between tetraploid and diploid parental species will cause fusion of diploid sperm/ egg with haploid sperm/egg
12) Answer- D
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