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Biology - core (B1 (Genes (Variation (Different version of the same gene…

- - - - Nucleus control the activities of the cell
      - Instructions on how an organism
        develops found in the nuclei
      - Sections of DNA has the genetic code for
        making a particular protein, called a gene
        
        Proteins can either be structural eg ones in hair and muscles
        or enzymes, such as digestive enzymes
    - - Found in the nucleus of most cells
      - Consist of long strands of DNA
    - - Different version of the same gene are called alleles
      - Alleles that are the same are called homozygous
      - Alleles that are different are called heterozygous
      - Recessive alleles only show if the individual has twp copies
      - Dominant alleles only need one to show
  - - - Females are XX, males XY
      - Gender is determine by the sperm, as it carries the Y chromosome, Y produces androgen's (male sex hormones) causing the embryo to become a male.