Inheritance and genetic disorders

• Science
• Upper Secondary (Key Stage 4)
• GCSE

Which of the following is a genetic disorder?

1. Cystic fibrosis
2. Malaria
3. Asthma
4. Diabetes

What is a Punnett square used for in genetic inheritance?

1. Measuring the genetic diversity within a population
2. Predicting the possible outcomes of a genetic cross
3. Identifying recessive traits in an individual
4. Determining the dominant gene in an organism

Which is NOT true about a carrier for a genetic disorder?

1. They are heterozygous for the disorder.
2. They have the disorder.
3. They had at least one They have atleast one parent with the disorder.
4. They may have siblings that have the disorder

What is the main cause of cystic fibrosis?

1. Viral mutation
2. Bacterial infection
3. Defective CFTR gene
4. Environmental factors

Which is NOT true about pedigrees?

1. They show only recessive disorders
2. They can be used to predict disorders in a family.
3. They indicate the sex of an individual.
4. They are useful in inferring genotypes of individuals.

What is a recessive gene?

1. A gene that is always expressed
2. A gene that is only expressed in the absence of its dominant counterpart.
3. A gene that is unrelated to dominant genes
4. A gene that is only expressed in the presence of its dominant counterpart

How are recessive genes represented in genetic diagrams?

1. By uppercase letters
2. By lowercase letters
3. By special characters
4. By numerical symbols

What is the likelihood of expressing a recessive trait when an individual carries two recessive alleles?

1. 100%
2. 50%
3. 25%
4. 0%

What are alleles?

1. Mutated chromosomes
2. Segments of DNA
3. Genetic mutations
4. Different forms of a gene

How many alleles do individuals inherit for each gene?

1. Three alleles
2. Two alleles
3. Four alleles
4. One allele

What is the term for alleles that are the same?

1. Homozygous alleles
2. Recessive alleles
3. Heterozygous alleles
4. Dominant alleles

What term is used to describe the physical appearance resulting from the combination of alleles?

1. Genotype
2. Genetic code
3. Phenotype
4. Chromosomes