The current estimate as to the number of functional genes in flies is about 14,000. How many different types of genes do they have and why is this number different from the total number of genes?
What will be an ideal response?
Ans: The estimate is that there are between 11,000 and 14,000 different types of genes and that many have multiple gene members that perform similar functions either in the same cell or in different cells at different times in development.
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Exposure to light and the pull of gravity will cause a root to grow downward into the soil
What will be an ideal response?
Which statement about receptors is false?
a. They are highly selective. b. They are also called ligands. c. They are proteins or glycoproteins. d. They are found inside the cell and on the cell surface. e. They are activated by binding to a signaling molecule.
Monogamy, a relatively rare system outside of birds, evolves when:
a. it is dangerous to compete for multiple mates. b. males compete for females who have higher parental investment. c. both males and females have low parental investment. d. both males and females have high and equal parental investment. e. females compete for males who have higher parental investment.
Which of the following is the BEST description of evolution as currently understood by modern biologists?
a) Evolution is goal directed. b) Evolution is influenced by the differential survival and reproduction of phenotypes. c) Evolution includes the results of selection for acquired characteristics. d) Evolution is synonymous with the process of mutation. e) Evolution is synonymous with the process of gene flow.