Note: The next six questions refer to either the same population or the same locus
across populations.
16. You are working to conserve a population of California Scrub Jays, Aphelocoma
californica, that are adapting to increased temperatures in Northern California. You find alleles
at two loci that increase heat tolerance by 0.98 and .46 C°, and are found at frequencies of
0.23 and 0.17, respectively. If the total phenotypic variance in heat tolerance, including
environmental effects, is 2.13 C°, what is the narrow sense heritability of heat tolerance
associated with these two loci?
17. Over the course of the first year, you find that scrub jays at the end of the generation are
.37 C° more tolerant of heat than the population of scrub jays at the beginning of the
generation. How much more heat tolerant do you expect the population of scrub jays will be
after 12 generations?
18. You find that the allele at the second locus is fully dominant. What do you expect will
happen to effect of this allele on the mean population phenotype as it increases in frequency
over these 12 generations?
