When killifish were present, what was the main selection factor affecting the average number of spots on male guppies?
a. reduction in spot number to avoid predation
b. increase in spot number to attract females
c. both selective forces were in effect when killifish were present
c
You might also like to view...
Transgenic animals made by pronuclear injection can be limited for studies of the links between genes and disease because
A) the transgene allele must be dominant to the normal, endogenous allele and some diseases are caused by recessive mutations. B) the transgene allele must be recessive to the normal, endogenous allele and some diseases are caused by dominant mutations. C) all diseases are caused by mutations in multiple genes. D) diseases are not caused by specific alleles of a gene, but by posttranslational modifications of proteins.
The Calvin cycle requires ________ and ________ from the light reactions in order to operate
A) glucose... carbon dioxide B) electrons... NADH C) ATP... NADPH D) RuBP... NADP+
If a cell contains lysosomes, what type of cell must it be?
a. a fungal cell b. a prokaryotic cell c. an animal cell d. a plant cell
Early classification systems of the bacteria employed all of the following characteristics except
A. the ability to photosynthesize. B. sporulation or binary fission. C. colony or filament forming. D. motility. E. rRNA sequences.