Principles of Inheritance and Variation

Inheritance of Two Genes


  • Both genes and chromosomes are transferred from generation to generation without any change.
  • Both alleles and chromosomes follow law of segregation
  • Both genes and chromosomes follow law of independent assortment.
  • Before cell division, both the chromosome and an allele of a gene get replicated. During mitosis, replicated chromosome and allele split which pass into the 2 daughter cells.
  • Finally both segregate during gamete formation, so that a gamete receives one allele and one chromosome of each pair.
  • Fusion of haploid gametes restores the diploid chromosome number and allele pairs in offspring.

Part-1: Watch this video for the topic from 0:15 to 9:12

Part-2: Watch this video for the topic from 0:09 to 12:24

Part-3: Watch this video for the topic from 0:09 to 5:31 

Part-4: Watch this video for the topic from 0:09 to 16:06

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