AGB 121: Principles of Animal Genetics and Population Genetics (2+1)

CHROMOSOME NUMBER

Haploid, Diploid

• Diploid cells (2N where N- chromosome number) have two homologous copies of each chromosome.
• The body cells of animals are diploid.
• Haploid cells (N) have only one copy of each chromosome.
• In animals, gametes (sperm and eggs) are haploid.

Homologous Chromosomes

• Diploid organisms have two copies of each chromosome (except the sex chromosomes). Both the copies are ordinarily identical in morphology, gene content and gene order and hence known as homologous chromosomes.
• Each pair of chromosomes made up of two homologs.
• Homologous chromosome is inherited from separate parents; one homolog comes from the mother and the other comes from the father.

Chromosome Number

• The number of chromosomes in a given species is generally constant.
• Chromosomes come in pairs.
• Different organisms have different numbers of chromosomes. Normally all individual of a species have the same chromosome number.
  • Diploid Chromosome number in Livestock
  • Diploid Chromosome number in Wild & Laboratory Animals
  • Diploid Chromosome number in different species of Birds

 T0 view "Chromosome Number Animation"