If a trait has a heritability of 0.5, this means that
A. all variation in the population is caused by genotypic differences.
B. all variation in the population is caused by environmental differences.
C. the variation in the population is the result of epigenetic effects.
D. the genotype and environment contribute equally to the variation seen in the population.
E. None of these is true.
D
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You are observing the embryonic development of a new species in your laboratory. This species has indeterminate development. You note a mutation in which one of the blastomeres (early cells) mutates and loses its function. What do you hypothesize would happen to this being?
A. Nothing—the remaining blastomeres would accomodate the formation of the necessary structures of the embryo. B. Immediate embryo death—the remaining blastomeres could not accomodate the formation of the necessary structures of the embryo. C. Uncertain future for the embryo—depending on which blastomere was lost, the remaining blastomeres might accomodate the formation of the necessary structures of the embryo. D. The embryo would certainly lack some features as a result of the lost blastomere.
As part of microbiology laboratory practical, you are given a mixed culture that contains Salmonella spp., E. coli, Enterococcus spp., Staphylococcus aureus and Saccharomyces cerevisiae and other microorganisms. Describe the methods you can use to isolate and identify Salmonella spp., E. coli and Staphylococcus aureus from the mixed culture?
What will be an ideal response?
Based upon today’s molecular evidence, Homo sapiens appear to have originated from:a
Europe. b. Indonesia. c. East Africa. d. South Africa. e. South America.
An eight-year-old girl in rural Wisconsin has chills, headache, and fever and reports having been bitten by mosquitoes. How would you confirm your diagnosis of arboviral encephalitis?
A) ELISA test for IgM antibodies B) brain biopsy for Negri bodies C) Gram stain of cerebrospinal fluid D) examination of local mosquitoes E) complement fixation test for IgG antibodies