IB DP Biology: Genetics

Question 1

The diagram shows a pedigree. According to the pedigree shown, which pattern of inheritance is indicated?

Accepted Answer

autosomal dominant trait

Question 2

Which of the statements correctly describes the effects of radiation or mutagenic chemicals on mutations in genes?

Accepted Answer

Radiation and mutagenic chemicals increase chances of random mutations.

Question 3

A man with hemophilia and a non-carrier woman have a child. The probability that the child will be an affected male is?

Accepted Answer

0%

Question 4

What is the probability of a child being female with blood group O if both parents are heterozygotes with blood group A?

Accepted Answer

0.125

Question 5

Karyograms are used to deduce sex and diagnose genetic diseases. What would not be determined from a karyogram?

Accepted Answer

base substitution in a gene on chromosome 13

Question 6

Which of these techniques was used by Cairns to measure the length of a DNA molecule?

Accepted Answer

autoradiography technique with radioactive isotopes

Question 7

Which of the statements about the chromosome number of a species is true?

Accepted Answer

The chromosome number stays mostly unchanged in evolution of a species.

Question 8

What deduction can be made about the allele for this condition from the pedigree chart?

Accepted Answer

it is autosomal recessive

Question 9

True or False? Codominant alleles produce a new phenotype when inherited together.

Accepted Answer

True

Question 10

Which is NOT known to damage DNA?

Accepted Answer

non-ionising radiation like microwaves

Question 11

True or False? Dogs have 78 chromosomes in striated muscle cells. Therefore, dogs have 78 chromosomes in their gametes.

Accepted Answer

False

Questions 11