In fruit flies, males are determined by the presence of an X and Y chromosome; females are determined by two X chromosomes. The gene for eye color is located on the X chromosome and is absent from the Y chromosome. The allele for white eyes is recessive and the allele for red eyes is dominant. If a red-eyed male is mated with a white-eyed female, what is the probability that their male offspring will be white-eyed?
A. 100%
B. 50%
C. 25%
D. 0%
A. 100%
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The study of algae is referred to as
A. phycology. B. mycology. C. phytology. D. None of the choices are correct.
Which of the following is NOT a theory of epigenetics explaining how cells can change gene function without changing the DNA base sequence?
A) Modification of DNA B) Mutations causing new beneficial alleles C) Modification of chromosomal proteins D) Altering transcription and translation with noncoding RNA
If a drug is designed to denature enzymes involved in digesting phenylalanine, why would patients treated with this drug develop phenylketonuria?
What will be an ideal response?
Which of the following statements correctly matches a body system with its function?
a) the digestive system facilitates absorption of substances into the bloodstream b) the respiratory system transports oxygenated blood throughout the lungs and body c) The excitatory system prevents harmful substances from entering the body d) The endocrine system transports hormones from place to place within the body