Principles of Inheritance and Variation Test

Question 1
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Skin colour is controlled by

A
Single gene

B
3 pairs of genes

C
2 pairs of genes

D
2 pairs of genes with an intragene

Question 2
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Human skin colour is an example of

A
Intragenic interaction

B
Intrallelic interaction

C
Quantitative inheritance

D
Pleiotropy

Question 3
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The given pedigree chart indicate

A
Autosomal dominant

B
Autosomal recessive

C
X-linked dominant

D
X-linked recessive

E
Insufficient information

Question 4
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According to theory put forth to explain the mechanism of organic evolution, when structure of a gene under goes a change, the trait it represents also changes. This results in a heritable variation in population, and may lead to the formation of new species from pre existing species.
Change in gene structure is termed as

A
Mutation

B
Variation

C
Genetic drift

D
Gene knock out

Question 5
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Which among the following cane be considered as a carrier of trait?

A
II-2

B
II-4

C
III-2

D
III-3

E
A, B and C are correct

Question 6
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Which of the following condition occurs in the person with genotype XO?

A
Cannot survive.

B
Will have immature, ambiguous (both male and female) reproductive systems.

C
Will be phenotypically female but sterile.

D
Does not produce steroid hormones.

E
None of the above.

Question 7
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An experiment was performed to test the ability of one wild type and four mutant strains of E.coli bacteria to grow in either minimal media or media that was supplemented with various amino acids.

Supplement None Arginine
Wild-type $$+$$ $$+$$
Strain 1 $$-$$ $$+$$
Strain 2 $$-$$ $$-$$
Strain 3 $$-$$ $$-$$
Strain 4 $$+$$ $$+$$

Supplement Threonine Histidine
Wild-type $$+$$ $$+$$
Strain 1 $$-$$ $$-$$
Strain 2 $$+$$ $$-$$
Strain 3 $$-$$ $$+$$
Strain 4 $$+$$ $$+$$
A $$\left(+\right)$$ sign indicates growth and a $$\left(-\right)$$ sign indicates no growth.
Strain 1 cannot grow without arginine due top mutation in:

A
DNA

B
mRNA

C
Protein

D
The anticodon region of the tRNA

E
rRNA

Question 8
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Which of the following statements is correct regarding mutations?

A
Many mutations are recessive, and it is unlikely that both parents will have the same recessive mutation.

B
Mutations are not passed to offspring because they are lethal to the organisms.

C
Mutations only occur in body cells and not in the gametes.

D
Most mutations are fatal and not passed to offspring.

E
Most mutations only occur in body cells and are usually repaired before the cells divide.

Question 9
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Read the passage and answer the following question.

A naturalist studies a species of private that inhabits the rain forest. The females live together in large social groups and compete for position in the social hierarchy, with seniority and food gathering ability as two of the determining factors for the leadership position. Males live within the group until they reach sexual maturity, at which time they leave the group and live on their own, mostly in isolation. Mature males only interact with the females during periods of mating which occur once a year. During mating season males compete for mating opportunities with aggressive displays and battles between males that occasionally lead to significant and even fatal injury. Males are commonly observed during mating season interacting with social groups other than those of their birth. Females give birth an average of five times during their lives, with two children that reach maturity. In addition to studying the behavior of the species, the naturalist identifies the following pedigree:
Black shading indicates that death occurred as a result of aggressive behavior initiated by the individual who died. Gray shading indicates death as a result of disease or as a result of aggressive behavior by another individual.

Which of the following resulting females of this species are often observed feeding and caring for the offspring of other females?

A
Fear of males

B
The hierarchical structure of the primate social group

C
Kin Selection

D
Instincts triggered by insufficient nutrition

E
Mutualism

Question 10
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With reference to the pedigree, the most likely genotype of individual III-5 is

A
Carrier

B
Unaffected

C
Homozygous recessive

D
Homozygous dominant

E
Heterozygous