Generation 50 Generation 1
The phenotype represents the neck length of animals that feed on leaves growing to greater heights.
The phenotype represents the thickness of fat layers in mammals living in regions that are getting colder.
The phenotype represents the body mass of insects in regions where predators prefer larger insects.
The phenotype' represents bone density for birds that live and feed underwater.

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.