Haiti is settled by peoples of both African and European ancestry. A young couple, both with mixed ancestry, marry and have several children. The children, who all have equal exposure to sunlight, vary widely in the amount of skin melanin. One child is lighter than both parents, and one is darker. The simple explanation for this is
A. polygenic inheritance.
B. the environment influenced the phenotypes of the children.
C. epistasis.
D. multiple alleles are available for the one chromosomal locus that governs skin color.
E. gene linkage.
Answer: A
You might also like to view...
Avery, MacLeod, and McCarty continued Griffith’s work with S. pneumoniae and concluded that DNA was the
hereditary material. If protein was the hereditary material instead of DNA, what would happen to mice after injection of heat-killed virulent bacteria mixed with live non-virulent bacteria after treatment with protease?
a. The mice would live. b. The mice would die. c. The mice would get sick but recover. d. The mice would grow tumors. e. The mice would degrade the protein.
If a female parent is a carrier, due to the presence of one copy of the recessive Hemophilia A allele being carried on the X chromosome, what are the odds that she could have an affected male child?
a. 0 b. 25% c. 50% d. 75% e. 100%
Which one of the following molecules is a weak base?
A. R-NH2 B. R-SH C. R-OH D. R-COOH E. none of the above
The counterstain in the acid-fast stain is
a. A basic dye. b. An acid dye. c. A negative stain. d. A mordant. e. Necessary to determine acid-fast cells.