Genetics And Evolution Test

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Genetics And Evolution Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

An inherited trait in human beings is influenced by

A
maternal DNA only

B
paternal DNA only

C
both maternal and paternal DNAs

D
neither paternal nor maternal DNA

E
the environment

Solution

The rules for inheritance of inherited traits in human beings are related to the fact that both the father and the mother contribute practically equal amounts of genetic material to the child. This means that each trait can be influenced by both paternal and maternal DNAs. Thus, for each trait there will be two versions in each child.
Question 2
1 / -0

Identify the vestigial organ(s) in humans.

A
Vermiform appendix

B
Nictitating membrane

C
Wisdom teeth

D
Erector pili

E
All of the above

Solution

Vestigial organs have lost all or most of their original function through evolution.
Question 3
1 / -0

Which of the following is not a vestigial organ in man?

A
Coccyx

B
Wisdom Tooth

C
Ileum

D
Vermiform appendix

E
None of these

Solution

The function of the ileum is mainly to absorb vitamin B₁₂ and bile salts and whatever products of digestion were not absorbed by the jejunum.
Question 4
1 / -0

What are alternative forms of a gene called?

A
Loci

B
Multiples

C
Traits

D
Alleles

E
Chromosomes

Solution

Alternative forms of a gene are called alleles.
Question 5
1 / -0

Which of these is homozygous recessive?

A
R

B
r

C
RR

D
rr

E
Rr

Solution

Homozygous recessive is denoted by rr. For example, a homozygous plant contains either of the following alleles for seed shape: (RR) or (rr). The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape.
Question 6
1 / -0

What will be the genotypic ratio of the cross between Tt and Tt?

A
1 : 1

B
3 : 1

C
1 : 2 : 1

D
2 : 1

E
1 : 1 : 1

Solution

TT : Tt : tt would be 1 : 2 : 1
Question 7
1 / -0

What will be the genotypic ratio of the cross between Rr and rr?

A
1 : 2 : 1

B
3 : 1

C
1 : 1

D
1 : 1 : 1

E
2 : 1

Solution

The genotypic ratio of Rr : rr is 2 : 2, i.e. 1 : 1.
Question 8
1 / -0

A couple with blood types A and B may have children with blood types

A
A and B only

B
AB

C
A, B and AB only

D
A, B and O only

E
A, B, AB and O

Solution

A couple with blood types A and B may have children with blood types A, B, AB and O.
Question 9
1 / -0

Which of the following is a not an autosomal abnormality during birth?

A
Cri du Chat syndrome

B
Patau syndrome

C
Klinefelter syndrome

D
Edwards syndrome

E
Down syndrome

Solution

Klinefelter Syndrome is sex-linked, because it is a genetic defect that results in the male having an extra X chromosome.
Question 10
1 / -0

If Tt mates with tt, what will be the characteristic of the offspring?

A
75% recessive

B
50% recessive

C
25% recessive

D
25% dominant

E
All dominant

Solution

When Tt mates with tt, the characteristics of offspring will be 50% recessive and 50% dominant.
Question 11
1 / -0

What is the genotype of an individual with Turner syndrome?

A
XXY

B
XYY

C
XO

D
XXX

E
YO

Solution

Turner syndrome is caused by a missing or incomplete X chromosome.The genotype is XO.
Question 12
1 / -0

Which of the following chromosomes carry the sex-linked traits?

A
X

B
13

C
Y

D
18

E
15

Solution

Sex-linked traits are carried on the X chromosome.
Question 13
1 / -0

What does the homologous organs indicate?

A
Parallel evolution

B
Natural selection

C
Convergent evolution

D
Common descendent

E
Genetic drift

Solution

Homologous organs have the same ancestral origin, same structure but different function.
Question 14
1 / -0

Pairs of characters separate during gamete formation. This is the law of __________.

A
inheritance

B
segregation

C
dominance

D
independent assortment

E
evolution

Solution

Mendel's law of segregation states that allele pairs separate during gamete formation, and randomly unite at fertilisation. According to law of dominance, in a cross of parents that are pure for contrasting traits, only one form of the trait will appear in the next generation. Offspring that are hybrid for a trait will have only the dominant trait in the phenotype. According to the law of independent assortment, alleles for different traits are distributed to sex cells (and offspring) independent of one another. Mendel gave three laws of inheritance.
Question 15
1 / -0

In a certain plant, purple flowers are dominant to red flowers. If the cross of two purple-flowered plants produces some purple-flowered and some red-flowered plants, what is the genotype of the parent plants?

A
PP x Pp

B
Pp x Pp

C
pp x pp

D
pp x PP

E
PP x PP

Solution

For any offspring to be recessive, each parent must have at least one p. In a cross between Pp X Pp , offspring produced will be PP, Pp, Pp, pp comprising 3 purple flowers and 1 red flower.

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Re-Attempt Weekly Quiz Competition

Genetics And Evolution Test - 4

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Genetics And Evolution Test - 4

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SHARING IS CARING

Question 1

maternal DNA only

paternal DNA only

both maternal and paternal DNAs

neither paternal nor maternal DNA

the environment

Solution

Question 2

Vermiform appendix

Nictitating membrane

Wisdom teeth

Erector pili

All of the above

Solution

Question 3

Coccyx

Wisdom Tooth

Ileum

Vermiform appendix

None of these

Solution

Question 4

Loci

Multiples

Traits

Alleles

Chromosomes

Solution

Question 5

R

r

RR

rr

Rr

Solution

Question 6

1 : 1

3 : 1

1 : 2 : 1

2 : 1

1 : 1 : 1

Solution

Question 7

1 : 2 : 1

3 : 1

1 : 1

1 : 1 : 1

2 : 1

Solution

Question 8

A and B only

AB

A, B and AB only

A, B and O only

A, B, AB and O

Solution

Question 9

Cri du Chat syndrome

Patau syndrome

Klinefelter syndrome

Edwards syndrome

Down syndrome

Solution

Question 10

75% recessive

50% recessive

25% recessive

25% dominant

All dominant

Solution

Question 11

XXY