The Arctic hare (Lepus arcticus) changes its coat color every spring from white to brown to maintain camouflage as the snow melts (in order to avoid predation); however, the precise timing of this color transition varies slightly among individuals. You find a best fit linear least squares regression of
y = 0.25 x + 0.023
between average parent and offspring times of color transition. On average hares start to change color on the 15th of April. Following a particularly warm year with unusually early snow-melt you find a shift in the surviving hares who now start the color transition on the 10th of April.
A) What is narrow sense heritability in color transition timing?
B) What is the response to selection (R ) following the warm year?
C) What is the strength of selection (S) during the warm year (in units of days)?