genetic inheritance

    Cards (14)

    • allele
      an alternative version of a gene
    • chromosome
      a long molecule of dna found in the nucleus. each chromosomes carries many genes
    • gamete
      a sex cell eg an egg cell or sperm cell in anima’s
    • dominant allele
      the allele for the characteristic that’s shown by an organism if two different alleles are present for that characteristic
    • recessive allele

      an allele whose characteristics only appears in an organism if there are two copies present
    • homozygous
      two alleles present are the same
    • heterozygous
      if the alleles are different for that trait (Hh)
    • cystic fibrosis
      caused by a recessive allele. it results in the body producing a lot of thick sticky mucus in the air passages and in the pancreas
    • polydactyly
      caused by a dominant allele. a baby is born with extra fingers or toes
    • embryo screening
      during IVF many genetic disorders can be detected by analysing the cells genes
    • people for embryo screening
      • helps people not suffer
      • treating disorders costs the goverment a lot of money
    • against embryo screening
      • implies people with genetic disorders are undesirable - causes prejudice
      • people may go to far with wanting desired features
      • screening is expensive
    • how many chromosomes does the body contain?
      23 pairs
    • 22 pairs control characteristics only, but one of the pairs carries the genes that determine sex.
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