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Variation can occur among offspring of living organism because…

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Variation can occur among offspring of living organism because

A. seeds are produced by self-pollination

B. zygotes are produced by cross fertilization

C. they are produced by binary fission

D. they are produced without fertilization

QUICK ANSWER…

B

DETAILS…  

Variation refers to genetic difference in DNA sequence among individuals of same population.

Genetic mutation is the principal factor that causes variation. Certain features that give rise to variation could be developed when genes and traits are reshaped during fertilization.

Now for the right answer to the above question:

  1. Option A is incorrect; seeds may be produced by self-pollination, but this is not the underlying reason for genetic variation.
  2. Option B is correct; the zygote is a living stage of embryo formed when female egg, containing its own DNA, gets fertilized by the male sperm which also contain its own DNA. This results in formation of zygote containing a derivative DNA. This cross fertilization could give rise to certain features and traits which could count as variation.
  3. C is incorrect; binary fission, not a good reason for variation.
  4. D is not the answer; variation is a consequence of transfer of traits through fertilization.
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QUICK TIPS…

You may please note that:

  • Variation occurs due to permutation of traits transmitted from parent to offspring during fertilization.

Use the questions and answers session to raise further questions and deal more on this topic…

/ culled from 2016 JAMB-UTME biology past question 27 /

Variation can occur among offspring of living organism because... » QuizTablet
Variation can occur among offspring of living organism because... » QuizTablet

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