An organism that has been extensively used to test the chromosomes theory of heredity is?
A. Drosophila melanogaster B. Muscar domestica C. Zea mays D. Homo sapiens Correct Answer: Option A – Drosophila melanogaster
A man and his wife are both heterozyous for the sickle-cell trait. The likely percentage of their offspring that will be either carriers or sicklers is?
A. 75% B. 50% C. 25% D. 100% Correct Answer: Option A – 75% Explanation An heterozygote for sickle-cell anaemia = AS Crossing two AS persons, we have one AA, two AS and one SS. ∴ The probability that the children are either carriers or sicklers = 34 =...
If a DNA strand has a base sequence TCA, its complementary strand must be?
A. ATG B. TAG C. GAT D. AGT Correct Answer: Option D – AGTThe pioneer organisms in ecological succession are usually the?
A. mosses B. lichens C. ferns D. algae Correct Answer: Option B – lichens
Soil fertility can best be conserved by the activities of?
A. Earthworm B. Man C. Rodent D. Microbes Correct Answer: Option D – MicrobesProducts
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