24. How did Mendel believe his results in calculating the ratio of dominant traits to recessive traits could be explained?
25. If offspring receive two sets of instructions for each characteristic, how are
the offspring's traits determined?
26. How long after his results were published in 1865 was Mendel's work widely
recognized?

Joe is breeding cockroaches in his dorm room. he finds that the average wing length in his population of cockroaches is 4 cm. he chooses the six cockroaches that have the largest wings; the average wing length among these selected cockroaches is 10 cm. joe interbreeds these selected cockroaches. from earlier studies, he knows that the narrow-sense heritability for wing length in his population of cockroaches is 0.6. a. calculate the selection differential and expected response to selection for wing length in these cockroaches. b. what should be the average wing length of the progeny of the selected cockroaches?

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?