The Pax6 gene codes for a transcription factor that initiates differentiation of cells that ultimately form the eye. Suppose that a researcher added an activator for the Pax6 gene to embryonic cells that are in the process of forming legs in Drosophila
What do you think the researcher will observe?
A) Legs and eyes will develop normally.
B) Legs will develop where the eyes normally develop.
C) Eyes will develop where the legs normally develop.
Answer: C
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The place where vibrations are translated into patterns of nerve impulses is the:
a. pinna b. ear canal c. middle ear d. cochlea e. eardrum
Which of the following environments would be
most likely to produce trees without annual rings? a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. none of these, because annual rings are characteristic of all trees
Which of these processes can be included among those responsible for the horizontal components of the figure above?
A) endosymbiosis B) mitosis C) binary fission D) point mutations
A. Define a gene
B. Consider two different species of yeast that have similar genome sizes. Is it likely that they contain the same number of genes? A similar number of chromosomes? What will be an ideal response?