Biology 1BI0 Genetics and Inheritance

A person’s mass is partially influenced by the alleles they inherit from their parents. Give two other factors that can influence a person’s mass.

Haemophilia is a sex-linked genetic disorder caused by a recessive allele on the X chromosome. Describe the phenotype of a male with the genotype X h Y.

Complete the Punnett square to show the genotypes of a male who is not affected by haemophilia, a female who is a carrier of the haemophilia allele and their possible offspring. Use the letters H and h for the alleles.

Some genetic disorders occur because the body does not produce enough of a protein. Describe how a mutation in the non-coding region of a gene can lead to the production of less protein.

Which describes the cause of a protein folding incorrectly? A a mutation in the coding region of a gene changes the sequence of the amino acids. B a mutation in the non-coding region of the gene changes the sequence of the amino acids. C a mutation in the coding region of a gene changes the shape of the tRNA molecule. D a mutation in the non-coding region of the gene changes the shape of the tRNA molecule.