Mutations of regulatory elements of developmental genes may have either dominant or recessive effects. If a mutation results in a silencer element that negatively regulates, which do you expect?
A) a recessive effect in which cis elements are up-regulated
B) a recessive effect in which cis elements are down-regulated
C) a dominant effect in which the silencer down-regulates gene activity
D) a dominant effect in which gene activity is up-regulated
E) a dominant effect in which the silencer is trans-activating
C
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The use of multiple forms of pest control including biological, chemical, and the planting of pest-resistant crops is a strategy commonly called ________.
A. multilevel systems approach B. intermediate species control C. integrated pest management D. restoration ecology
The part of the ear actually responsible for
hearing is the
a. hammer, anvil, and stirrup. b. cochlea. c. vestibular apparatus. d. organ of Corti. e. combination of the organ of Corti and the vestibular apparatus
What is the term given to the average frequency of heterozygotes at all loci of an individual? This value can also be expressed as the fraction of genes that are heterozygous in the genotype of an average individual
What will be an ideal response?
For each statement below, indicate whether it is true or false, and explain why
A. To meet a challenge or develop a new function, evolution essentially builds from first principles, designing from scratch, to find the best possible solution. B. Nearly every instance of DNA duplication leads to a new functional gene. C. A pseudogene is very similar to a functional gene but cannot be expressed because of mutations. D. Most genes in vertebrates are unique, and only a few genes are members of multigene families. E. Horizontal gene transfer is very rare and thus has had little influence on the genomes of bacteria.