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In Drosophila melanogaster, a gene for eye color is located…

In Drosophila melanogaster, a gene for eye color is located on the X chromosome. The allele for red eyes (X^R) is dominant over the allele for white eyes (X^r). A female fruit fly with the genotype X^R X^r is crossed with a male with the genotype X^R Y. What proportion of their male offspring would you expect to have white eyes?

Carl has $20, which he’d like to spend on some combination o…

Carl has $20, which he’d like to spend on some combination of coconuts and pineapples.  His goal is to maximize utility from consumption — we provide here his total utility for coconut and pineapple consumption:   coconuts pineapples quantity total utility quantity total utility 1 60 1 80 2 112 2 144 3 156 3 192 4 196 4 224 5 228 5 240   Carl’s total utility is the sum of his utility from consuming coconuts and his utility from consuming pineapples.  Coconuts cost $4 each.  First, say that pineapples cost $8 each.  If so, how many coconuts does Carl purchase? [c1]  How many pineapples? [p1]  What is his total utility? [u1] Say that the grocery store discounts pineapples to $4 each.  Solve the problem again.  How many coconuts does Carl purchase now? [c2]  How many pineapples? [p2]  What is his total utility? [u2]