Crossing true breeding dark-coated sheep with true breeding light-coated sheep always results in 100% dark-coated offspring. you are screening a population of 300 soay sheep for coat color, and you count 243 dark sheep and 57 light sheep. what is the genotype frequency of the homozygous recessive sheep for tyrp1 gene if the population is in hardy-weinberg equilibrium?

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.