Which change describes a demographic transition?
Question 19 options:

a population moves from a high birthrate and death rate to a high birthrate and low death rate

a population moves from a high birthrate and low death rate to a low birthrate and death rate

a population moves from a low birthrate and death rate to a low birthrate and high death rate

a population moves from a high birthrate and death rate to a low birthrate and low death rate

Ithink the answer is c. i’m not sure though i’ll notify you when i have an exact answer!

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait. 

Self-reports would be the answer.