A diploid organism is heterozygous for 4 | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

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Academic session 2026-27, Chapter 4 in the current curriculum.

Welcome to the NCERT Solutions for Class 12 Biology - Chapter Principles of Inheritance and Variation. This page offers a step-by-step solution to the specific question from Exercise 1, Question 3: A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 3: A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?
Answer:

Locus is a fixed position on a chromosome, which is occupied by a single or more genes. Heterozygous organisms contain different alleles for an allelic pair. Hence, a diploid organism, which is heterozygous at four loci, will have four different contrasting characters at four different loci.

For example, if an organism is heterozygous at four loci with four characters, say Aa, Bb, Cc, Dd, then during meiosis, it will segregate to form 8 separate gametes.

If the genes are not linked, then the diploid organism will produce 16 different gametes. However, if the genes are linked, the gametes will reduce their number as the genes might be linked and the linked genes will be inherited together during the process of meiosis.

Diploid Organism

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Comments

  • Pc
  • Nov 27, 2019

Thanks for help!!!

  • Bimola Salam
  • Nov 14, 2019

Formula for calculating no. of gametes is 2 to the power n, where n is no of the genes. Here heterozygous for four loci means, four diff genes as alleles for a gene are present on same locus on the homologois pair. So the answer is 2^4=16

  • Reesha
  • Nov 12, 2019

I can't understand

  • Prashant
  • Jul 01, 2019

I can't understand

  • Ashu sandhu
  • Jun 06, 2019

Plz ask me how many types of gametes can be produced ??

  • Ashique
  • Mar 30, 2019

So answer is 8 or 16? If 16 please explain I didn’t understand

  • Ronuj doley
  • Aug 04, 2018

formula is 2^n.where n=no. of loci .therefore,2^4=16 types of gametes

  • Ephraim Malekar
  • May 20, 2017

If a diploid organism is homozygous for two loci then the gametes formed will be say A B C D respectively.Since it\'s a diploid organism the number of gametes will be 2×n. Therefore the number of gametes will be 2×4=8

  • sanju sheikh
  • Jan 14, 2017

I have a question ... If rwo loici are homozygous. .. thn vot will be the no. Of gametes produced...

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Welcome to the NCERT Solutions for Class 12 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 3: A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced?....

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