Question

1. A large population of grass occurs in an area with two distinct kinds of soil. Some patches of soil contain heavy metal ions, others do not. The genotypes at the S locus determine how well grass plants survive in the different soil types: SS individuals survive best in heavy metal soils, ss individuals survive best in normal soils, and Ss individuals do not survive very well in either soil. Grass seeds are dispersed by the wind to different soil types; because normal soil is most common, ss individuals have the highest survival, and a relative fitness of 1. SS individuals survive next best, having a relative fitness of 0.70. Ss individuals have a relative fitness of 0.40. In this population of grass, the allele frequency of S at the start of a generation is 0.50. What will the allele frequency of S be at the start of the next generation?
2. You're studying the genetics of sand fleas on 3 nearby small islands of the Seychelles chain, named Poivre, Florentin, and South Island. Assume that fleas occasionally drift on floating debris among these three islands (and in roughly similar numbers to/ from each island) but that sand fleas from other islands never make it to these islands. Right now, the frequency of the "A" allele at a particular gene (not experiencing
   any selection) in these fleas is 0.2 in Poivre, 0.45 in Florentin, and 0.5 in South Island. What do you expect to happen to the frequency of "A" on Florentin in the next few generations?

	There is not enough information to answer this question
	No change, stays the Same
	Goes down
	Goes up

3. You're studying a population of an endangered wildcat in India. This population has been hunted aggressively, but there was also a rumor that the remaining ones are heavily inbred. You sample all 500 remaining cats to look for evidence of inbreeding and get the following genotypes:

AA: 31,
Aa: 188,
aa:281

What do you conclude?

	Cats don't self-fertilize, so this was a dumb thing to even try to calculate
	The cats are mildly inbred (F>0 but less than 0.3)
	The cats are not detectably inbred
	The cats are heavily inbred (F>0.3)

Answer 1

Answer 1:

0.328 or 0.33