Mutations

Question 0

Chromosome mutations

Answer 0

Non-disjunction of chromosomes during meiosis

During crossover bits of chromosome is lost

Chromosome failing to attach to the spindle

Question 1

Gene mutations

Answer 1

Substitution of nucleotides

Addition of nucleotides

Deletion of nucleotides

Question 2

Down syndrome

Answer 2

Three copies of chromosome 21

Pairs of chromosomes don’t separate in meiosis

Question 3

Turner’s syndrome

Answer 3

Only have one X chromosome

Symptoms: shortness, webbed neck, sterility, lack of breasts

Treated with hormones

Question 4

Klinefelter syndrome

Answer 4

Males are XXY

Symptoms: tallness, small testes, female characteristics