While males have one X chromosome, women have two. Women, however, have X chromosome inactivation, resulting in genes from only one of their X chromosomes being used. What advantage does this have? Using calico cats as a reference, explain when X chromosome inactivation may take place and what impact it has on the adult organism.
What will be an ideal response?
X chromosome inactivation occurs when one X chromosome from a pair found in a female's cell is silenced during development. If it did not occur, females would produce double the amount of some proteins compared with males, whose one X chromosome has may genes that are not duplicated on their Y chromosome.
You might also like to view...
A friend of yours has 30 Spanish vocabulary words to learn by tomorrow. Which of the following is the best way for her to use flashcards to study?
A) Study each card only once. B) Divide the cards into five piles and then study each pile four times before moving on to the next pile. C) Go through the entire pile of 25 cards four times. D) Divide the cards into 10 piles and then study each pile four times before moving on to the next pile.
Vivian is in a period of REM sleep. She will exhibit all of the following characteristics
EXCEPT a. rapid EEG waves. b. dreams. c. increased vaginal secretions. d. facial movements. e. rapid eye movements.
Leptin is a
A) protein produced by fat cells. B) neurotransmitter. C) hormone produced by the adrenal glands. D) hormone produced by the pituitary gland.
During medieval times, a person who behaved abnormally was believed to be ________.
A. demon possessed B. psychologically weak C. schizophrenic D. mentally ill