Which individuals have the greatest fitness in an area where malaria is common?
A) individuals of any genotype who become infected with malaria before the age of five
B) individuals homozygous for the sickle cell anemia allele
C) individuals homozygous for the normal globin allele
D) individuals heterozygous for the normal and sickle cell anemia alleles
D
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Which of the following is TRUE of a morphogen?
A. It is a signaling molecule required for cell-to-cell contact within the embryo. B. It is a signaling molecule that induces the differentiation of cells within the embryo. C. It is a signaling molecule that induces blastulation of the developing embryo. D. It is a signaling molecule that induces implantation of the embryo into the uterus of mammals. E. It is a signaling molecule that separates out cytoplasmic factors to their respective cells within the developing embryo.
Boiling water (100°C) can normally destroy endospores.
Answer the following statement true (T) or false (F)
The wide-ranging effect of a single gene is called
a. heterozogosity. b. homozygosity. c. segregation. d. pleiotropy. e. co-dominance.
Using hair as the derived trait, four of the following organisms fit in the clade. Which one does not fit?
A. Whale B. Crocodile C. Wolf D. Elephant E. Tiger