Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
A. 25%
B. 75%
C. 50%
D. 0%
C. 50%
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One of the main safety guidelines of DNA research is that ________
a. the host organisms are all female b. the host organisms are all male c. the host organisms can only survive under a narrow range of laboratory conditions d. there were no guidelines e. the host organisms can only be purchased from certain laboratories
Tumor suppressor genes _____.?
a) encode proteins that help prevent uncontrolled cell growth b) are cancer-causing genes introduced into cells by viruses c) are frequently overexpressed in cancerous cells d) often encode proteins that stimulate the cell cycle
The main center for homeostatic control of the
internal environment is the a. pineal gland. b. medulla oblongata. c. hypothalamus. d. thalamus. e. cerebrum
You would not expect to find homeobox or homeobox-like genes in:
a. Drosophila. b. Arabidopsis. c. C. elegans. d. H. sapiens e. E.coli