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Inheritance
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Inheritance

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Transcript

  • 1. Inheritance
  • 2. Chromosomes
    • Chromosomes are thread like structures found in the cell nucleus
    • Human cells have 46 chromosomes
    • The gametes (sperm & egg) have only 23 chromosomes
    • The 46 chromosomes in the body cells are copies of the 23 from mother’s egg and the 23 from the father’s sperm
    • Chromosomes are made up of DNA and proteins (histones)
  • 3.  
  • 4.
    • Chromosomes occur in pairs inside the nucleus
    • In each pair, one chromosome comes from the male parent, the other from the female.
    • This is why people look similar to their parents but not exactly like either of them
    Human Chromosomes
  • 5. Karyotype of a female
  • 6. Sex Chromosomes
    • The gender of an organism is determined by its sex chromosomes.
    • In most species there are two types of sex chromosomes, X and Y
    • Females have two X chromosomes in each of their body cells
    • Males have an X and a Y chromosome in each cell
  • 7.
    • All eggs contain a single X chromosome
    • Half of the sperms from a male contain Y chromosome and the other half contain X chromosome
  • 8. DNA
    • DNA stands for deoxyribonucleic acid
    • It carries all the information a cell requires
  • 9.  
  • 10. DNA
    • DNA looks like a spiral ladder.
  • 11.  
  • 12. Gene
    • A gene is a segment of DNA containing the instruction for the formation of one particular protein.
    • Humans have around 30,000 genes.
    • “ Genetics is the science of genes, heredity, and the variation of organisms”.
  • 13. Haploid & Diploid condition
    • Haploid nucleus contains a single set of unpaired chromosomes.
      • Gametes
    • Diploid nucleus contains two sets of chromosomes
      • Body cells