test 41- genetics

Question 1

• each …. has another one exactly like it.
• it’s the sex …. which determines an individual’s sex.
• the Y …. is responsible for male characteristics.

p.s. all 3 spaces are answered with the same term.

Answer 1

chromosome

Question 2

• …. is caused by an extra chromosome.
• a foreshortened head, upward slanting eyes and a flat nasal bridge are some of the characteristic physical features of …. .
• the chance of a women having a baby with …. increases considerably with age.

p.s. all 3 spaces are answered with the same term.

Answer 2

down’s syndrome

Question 3

• …. is enclosed in the central nucleus of the cell.
• the whole nature of a cell depends on the kinds of …. .
• during division of a cell, the …. duplicates itself.

p.s. all 3 spaces are answered with the same term.

Answer 3

DNA (deoxyribonucleic acid)

Question 4

• brown eyes are …. over blue eyes.
• if one parent has a …. characteristic from both his/her parents, he/she must pass it on to his/her children.
• gregor mendel discovered that tall pea plants were …. .

p.s. all 3 spaces are answered with the same term.

Answer 4

dominant

Question 5

• each individual has a unique set of genes …. from the parents.
• sickle cell disease is an …. disease of the blood.
• there is a chance of 1 in 4 that cystic fibrosis will be …. by a second child born to parents of a child with the disease.

p.s. all 3 spaces are answered with the same term.

Answer 5

inherited

Question 6

• some diseases tend to run in families without observing any known rules of …. .
• with some diseases the effects of …. and environment cannot always be distinguishing.
• the material from which chromosomes are formed governs …. .

p.s. all 3 spaces are answered with the same term.

Answer 6

inheritance

Question 7

• the child of normal parents may be affected by …. in an ovum or a sperm.
• a sudden change in the genetic makeup of an organism is known as …. .
• …. leads to people being born with a defect.

p.s. all 3 spaces are answered with the same term.

Answer 7

mutation

Question 8

• a sex-linked …. transmits haemophilia.
• sickle-cell anaemia is the result of a defective recessive …. .
• in britain, the commonest disease due to a single pair of recessive ….. is cystic fibrosis.

p.s. all 3 spaces are answered with the same term.

Answer 8

gene

Question 9

• the chance that a child will be born with a serious …. defect is 1 in 50.
• some …. disorders can be cured.
• …. engineering has provided has a plentiful supply of insulin.

p.s. all 3 spaces are answered with the same term.

Answer 9

genetic