Suppose that each species of Galápagos tortoise has a distinctive shell. Variations in shell size make some tortoises better adapted for defence. Imagine an island where many hunt on these tortoises; individuals with a larger shell would be more likely to survive and reproduce than would tortoises with smaller shells. These favoured individuals would pass on the genes that produce larger shells to their descendants, while those with smaller shells would not reproduce, leading to extinction. Which of the following would be most likely to drive this event?
a. spontaneous selection
b. hereditary selection
c. natural selection
d. artificial selection
Answer: c. natural selection
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A) zinc B) iron C) iodine D) molybdenum E) folic acid
Regions of the genome that are inactive often have ________ of C nucleotides.
Fill in the blank(s) with the appropriate word(s).
RNAi
A) depletes the mRNAs of specific genes. B) uses dsRNA to bind to transcription factors. C) can be used to create functional knockin mutants. D) is not useful for the study of development.
A hormone is produced in small amounts in a tissue, and it causes a physiological action within that same tissue soon after its production.
Answer the following statement true (T) or false (F)