Two genes, A and B, are located 30 map units apart. The dihybrid shown in the attachment is mated to a tester aa bb. What proportion of the offspring is expected to be dominant for both traits?
A. 0%
B. 15%
C. 30%
D. 35%
E. 70%
Ans: D. 35%
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One key principle of natural selection is that there is competition for resources
A. true B. false
In order to distinguish between individuals, DNA genotyping (DNA profiling) detects the difference in short tandem repeats:
A. on unique genes, for example histones (H1A). B. on a single chromosome, the repeats being approximately 200 bp. C. on homologs, the repeats being approximately 200 bp. D. on a single chromosome, the repeats being usually <100 bp. E. on homologs, the repeats being usually <100 bp.
Chitons, snails, clams and squid all belong to this phylum:
a. Mollusca. b. Gastropoda. c. Bivalvia. d. Platyhelminthes. e. Cephalopoda.
An example of an obligatory mutualism involves which two organisms?
a. acacia trees and ant colonies b. mycorrhizae and legumes c. cattle egrets and cattle d. plants and herbivores e. tapeworms and pigs