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If the offspring of a cross between a brown mouse (bb) and a black mouse...

Biology
JAMB 1999

If the offspring of a cross between a brown mouse (bb) and a black mouse (BB) are allowed to interbreed, how many different genotypes would result?

  • A. 2
  • B. 3
  • C. 4
  • D. 5
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Correct Answer: Option B
Explanation

Cross between bb and BB → Bb   Bb   Bb   Bb

Bb genotype fills the first filal generation

 

 Bb * Bb → BB,   Bb,   Bb,   bb (second filal generatio)


The 3 genotypes (BB, Bb and bb) are formed

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts