inherited disorders

• describe gamete

  male or female haploid cell made from meiosis that fuses in fertilisation
• describe chromosome

  coiled dna found in nucleus
• describe gene

  small section of dna that codes for specific amino acid sequence to form particular protein
• describe allele

  different forms of a gene
• describe dominant allele

  always expressed
• describe recessive allele

  only expressed with two alleles
• describe homozygous

  two same allele
• describe heterozygous

  two different alleles
• describe genotype

  combination of alleles of an organism
• describe phenotype

  observable characteristics of an organism
• give types of inherited disorders

  cystic fibrosis and polydactyly
• describe cystic fibrosis

  disorder of cell membrane causing sticky mucus build up caused by recessive allele
• describe polydactyly

  child born with extra fingers or toes caused by dominant allele
• describe embryo screening

  test embryos for inherited disorders causing damaged embryos to be discarded
• give advantages of embryo screening

  • stop suffering
  • save money
• give disadvantages of embryo screening

  • ethical objections
  • prejudice to inherited disorders
  • expensive
  • lead to designer babies