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Author Question: Presbyopia is characterized by ________. A) retinal detachment B) legal blindness C) ... (Read 121 times)

ts19998

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on: Jun 27, 2018
Presbyopia is characterized by ________.
 
  A) retinal detachment
  B) legal blindness
  C) blepharoptosis
  D) loss of flexibility of the lens

Question 2

Fraternal twins occur when ________.
 
  A) a single fertilized ovum splits
  B) two ova are fertilized
  C) the father's sperm contains an X chromosome
  D) the father's sperm contains a Y chromosome


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swimkari

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Reply #1 on: Jun 27, 2018
Answer to Question 1

D
Explanation: A) Presbyopia involves the lens, not the retina.
B) Presbyopia is blurriness of vision, not legal blindness.
C) Presbyopia involves the lens, not the eyelid.
D) Correct Presby/o- means old age. The lens becomes less flexible in older persons.

Answer to Question 2

B
Explanation: A) This describes identical twins, not fraternal twins.
B) Correct Because two different ova are fertilized, fraternal twins can be two males, one male and one female, or two females.
C) The father's sperm contains either an X or Y chromosome, but this is not the cause of fraternal twins.
D) The father's sperm contains either an X or Y chromosome, but this is not the cause of fraternal twins.


ts19998

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Reply 2 on: Jun 27, 2018
Great answer, keep it coming :)

alexanderhamilton

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Reply 3 on: Yesterday
Gracias!

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