In insects and crabs, which hormone stimulates molting?
1.Ecdysone
2.Juvenile hormone (JH)
3.Prothoracicotropic hormone (PTTH)
4.Melatonin
1
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When differences in the phenotype due to the environment can be ignored:
A. the environmental component of a complex trait can be more easily identified. B. the genetic variation underlying phenotypic differences can be more easily identified. C. the trait is not considered a complex trait. D. epistatic interactions determine phenotypes. E. All of these choices are correct.
Because Lesch—Nyhan syndrome is a recessive X-linked disease, females who have an allele with the mutation responsible for this disease are generally symptom-free
Indicate whether the statement is true or false
Genetic mutations in asexually reproducing organisms lead to more evolutionary change than do genetic mutations in sexually reproducing ones because _____
A) asexually reproducing organisms, but not sexually reproducing organisms, pass all mutations on to their offspring B) sexually reproducing organisms can produce more offspring in a given time than can asexually reproducing organisms C) more genetic variation is present in organisms that reproduce asexually than is present in those that reproduce sexually D) asexually reproducing organisms have more dominant genes than organisms that reproduce sexually
Suppose that while the reverse osmosis system is running tank B becomes contaminated with salt water such that it ends up with a higher salt concentration than tank A. What would happen if the reverse osmosis system was turned off?
A) There would be a net flow of water from tank A to tank B. B) There would be a net flow of water from tank B to tank A. C) Water would flow in equal amounts in both directions.