HSC: Genetics and Inheritance

How many chromosomes do humans have?

• 23

• 46

• 92

• 44

What key term is used to describe the specific variant of a gene that could be dominant or recessive?

• Allele

• Predisposition

• Inheritance

• Phenotype

What key term describes the observable characteristics of a gene once they have interacted with the environment?

• Phenotype

• Genotype

• Socio-economic factors

• Predisposition

Heterozygous means?

• When a person has two copies of either a dominant or recessive gene

• When a person has one dominant and one recessive copy of a gene

Genetic predisposition means that a person's genes will determine their health.

• True

• False

Answer explanation

False - genetic predisposition means a person's genes make them more likely to develop an illness but it is dependent upon their environment.

An illness has been found to be carried on a recessive gene. Mum and dad both don't have the illness. Both go for testing, mum is a carrier of the gene but dad is not.

What is the likelihood that their child will develop the illness?

• 0%

• 25%

• 50%

• 100%

Answer explanation

If the disorder is recessive and dad is not a carrier, then there is no chance that the child will develop the disorder. However the child could be a carrier of the gene.

Which inherited disorder results in sticky mucus building up in a person's lungs and digestive system?

• Cystic Fibrosis

• Huntington's Disease

• Brittle Bones Disease

• Sickle Cell Anaemia

Which genetically linked disorder is associated with red blood cells struggling to carry oxygen around our bodies.

• Sickle Cell Anaemia

• Huntington's Disease

• Brittle Bones Disease

• Cystic Fibrosis

Which genetically linked disorder is associated with weakened bones?

• Cystic Fibrosis

• Brittle Bones Disease

• Sickle Cell Anaemia

• Huntington's Disease

Which genetically linked disorder results in the brain slowing down over time, memory loss and difficulties concentrating?

• Huntington's Disease

• Brittle Bones Disease

• Cystic Fibrosis

• Sickle Cell Anaemia