Which two observations led Darwin to conclude that there is competition for survival?
A) Overproduction and limited resources
B) Fossils and mutations
C) Gene and allele differences in organisms
D) Natural selection and descent with modification
A
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In human blood groups, the fact that an individual can have an AB blood type is an example of ___________
A. incomplete dominance B. incomplete penetrance C. sex-influenced trait D. temperature-sensitive conditional allele E. codominance
The role of nutrition in the improvement of spina bifida is an example of a _____ effect
A. cumulative B. polygenic C. epigenetic D. penetrative E. phenotypic
One difference between a gene mutation and a chromosomal mutation is that
a. A gene mutation affects the DNA of more genes than a chromosomal mutation b. A gene mutation can involve a insertion or deletion, but cannot result in a frameshift c. A chromosomal mutation can change the number of chromosomes in a cell d. A chromosomal mutation is more likely to be passed on to offspring or daughter cells
The electrons at the very end of both photosystems are eventually picked up by an electron carrier to become:
A) H2O. B) ATP. C) O2. D) sugar. E) NADPH.