18. In humans, hemophilia is inherited as a recessive allele linked to the X chromosome (Xb. Hemophilia is a disorder that results in the failure of blood to clot. A man and a woman who are
both normal clotters have three children named Amy, Harry and Mary. Harry is a hemophiliac,
who has a normal clotting daughter. Mary has normal clotting blood and she has two sons, one
of whom is a hemophiliac. Amy and her five sons are all normal clotters. What are the probable
genotypes for the 2 grandparents, 3 children and 8 grandchildren?
8

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.