Question

1) Choose the best answer.

A mutation that changes only one small area or one nucleotide in a gene is a(n) _____________.

substitution

point mutation

insertion

deletion

2) Choose the best answer.

A ___ is a permanent change in the DNA sequence of a gene.

codominance

pleiotropy

mutation

modifying gene

3) Choose the best answer.

What is the probability of a person with a dominant genetic disorder having a child with the same disorder?

Answer 1

1) point mutation

2) mutation

3) 50% (one-half) — assuming the affected parent is heterozygous for an autosomal dominant allele and the other parent is unaffected.