A test cross of an organism of unknown genotype is done when the organism is crossed to an organism that is:
A. a heterozygote.
B. a dominant homozygote.
C. a recessive homozygote.
D. All of the answer options are correct.
C
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The DNA in chromosomes is organized by wrapping around proteins called ________
a. nucleosomes b. centrosomes c. histones d. centromeres
A body plan with a pseudocoelom is indicated
by a. A. b. B. c. C. d. A and B. e. B and C.
Bacteria present in the digestive tracts of some herbivores function to:
a. provide bulk to their feces. b. produce minerals for their hosts. c. detoxify harmful materials found in the food. d. digest the animal waste products from the herbivore diet. e. digest the cellulose cell wall of plant cells.
Why do populations farther from Africa have more deleterious mutations in their genome?
A. Repeated bottlenecks and founder effects made genetic drift more intense more often. B. Populations farther from Africa have been exposed to more mutagens in the environment. C. Those populations have experienced more intense natural selection, so more deleterious alleles increased in frequency by genetic hitchhiking. D. As people migrated over the globe they interbred with Neanderthals and Denisovans. E. The populations are younger, so purifying selection has not had time to purge deleterious mutations from the populations.