Genetic diaorders

• What type of allele is responsible for polydactyly?

  Dominant allele
• What is the physical manifestation of polydactyly?

  Extra finger or toe
• What type of allele is associated with cystic fibrosis?

  Recessive allele
• What is the primary issue caused by cystic fibrosis?


  Disorder of cell membranes leading to thick mucus production
• What is genetic screening used for?

  To check embryos for genetic disorders
• What is a potential ethical concern of genetic screening?

  It might lead to the destruction of embryos
• What does CRAM stand for in the context of genetic disorders?

  It is not defined in the provided material
• How can you determine if the allele for CRAM is recessive?


  Unaffected parents can have an affected child
• What is the genotype of individuals 7 and 8 in the context of CRAM?

  They are heterozygous
• What role do mutations play in evolution?

  They cause variation within a species
• How do some members of a species become better suited to their environment?

  They possess characteristics that are advantageous
• What are the key concepts related to genetic disorders mentioned in the study material?

  • Polydactyly: Dominant allele causing extra fingers or toes
  • Cystic Fibrosis: Recessive allele causing thick mucus production
  • Genetic screening: Checking embryos for disorders
  • Ethical concerns: Potential destruction of embryos
  • CRAM: Involves heterozygous parents with unaffected children having affected offspring
  • Evolution: Mutations cause variation and some traits are better suited to the environment