Heredity and Evolution Test

Result

Heredity and Evolution Test - 18

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

New species may be formed if
(i) DNA undergoes significant changes in germ cells.
(ii) Chromosome number changes in the gamete.
(iii) There is no change in the genetic material.
(iv) Mating does not take place.

A
(i) and (ii)

B
(i) and (iii)

C
(ii), (iii) and (iv)

D
(i), (ii) and (iii)
Solution
- New species formation can not result if the genetic material is unchanged. Usually, the genetic material gives rise to similar species through mating in sexually reproducing organisms.
- If genetic material undergoes significant changes in the germ cells which gives rise to gametes of an individual then mating will give rise to different species than the original.
- If there is a major deletion, duplication, or missing chromosomes in the germ cell, the genetic material is changed and so is its expression. Thus, it may give rise to new species than original.
Hence, answer A is correct.
Question 2
1 / -0

The maleness of a child is determined by

A
The X chromosome in the zygote

B
The Y chromosome in zygote

C
The cytoplasm of germ cell which determines the sex

D
Sex is determined by chance
Solution
- A male has sex chromosomes X and Y, while a female has XX as sex chromosomes.
- During fertilization, the mother always contributes an X chromosome while the father either contributes an X or a Y chromosome.
- Hence, the maleness of the child is determined by the presence of the Y chromosome in the zygote contributed by the sperm.
So, the correct answer is 'The Y chromosome in zygote'.
Question 3
1 / -0

Why acquired characters are not inherited?

A
Acquired characters do not produce change in the DNA of germ cells.

B
Acquired characters produce change in the DNA of germ cells.

C
Acquired characters do not produce change in the DNA of body cells.

D
All of the above.

Solution

Acquired characters do not produce change in the genes of germ cells, so they cannot be inherited.
For example- if tails of mice are cut in the first generation, and then breeding is done, the new mice born will have full tails. The cut tail of mice is an acquired trait which is never passed on to their progeny. This is because cutting of mice tails does not change the genes of their reproductive cells.
So, the correct answer is 'Acquired characters do not produce change in the DNA of germ cells.'
Question 4
1 / -0

A basket of vegetables contains carrot, potato, radish, and tomato. Which of them represent the correct homologous structures?

A
Carrot and potato

B
Carrot and tomato

C
Radish and carrot

D
Radish and potato

Solution

Homologous structures are those that are related to common ancestry. Such structures have a common structural plan and are adapted to suit different functional roles. Of the given options, potato is a storage stem, tomato is a fruit (in fact, it is a berry), radish and carrots are roots. Since both radish and carrots are roots, they have similar structural plans and are homologous.
So, the correct answer is 'Radish and carrot'
Question 5
1 / -0

How is the sex of a newborn determined in humans?

A
The sex of the individual is genetically determined.

B
The sex of the individual is phenotypically determined.

C
The sex of the individual is physiologically determined.

D
All of the above
Solution
Sex is determined at the time of fertilization. A human male has an XY sex chromosome and produces two types of sperms, either with an X chromosome or with a Y chromosome.
A human female has a XX chromosome and produces ova of one type. If the sperm containing the X chromosome fuses with the ovum, the individual will be a girl, and the sperm containing the Y chromosome fuses with the ovum, the individual will be a boy.
Thus, the sex of the individual is genetically determined.
Question 6
1 / -0

The number of chromosomes in parents and offsprings of a particular species remains constant due to

A
Doubling of chromosomes after zygote formation

B
Halving of chromosomes during gamete formation

C
Doubling of chromosomes after gamete formation

D
Halving of chromosomes after gamete formation

Solution

During gamete formation, there is meiosis in which mother cell divides into 4 cells having a half number of chromosomes. In fertilization, male and female gametes fuse to form a zygote having the same number of chromosomes as parents. Hence, the number of chromosomes remains constant.
Question 7
1 / -0

The wings of a housefly and the wings of a pigeon are examples of:

A
Analogous organs

B
Vestigial organs

C
Respiratory organs

D
Homologous organs
Solution
- Analogous organs are organs that have a different origin but have the same functions.
- In birds, the wings are modified forelimbs, while in insects they are made of the cuticle.
- But the wings of a housefly and the wings of a pigeon have the same function of flying. Hence, they are analogous organs.
So, the correct answer is option A.
Question 8
1 / -0

Mendelian factors or genes as well as chromosomes are present in_______.

A
Pairs

B
Singles

C
May be paired may be not

D
All of the above
Solution
- Mendelian factors or genes, as well as chromosomes, are present in pairs.
- According to this Mendelian concept, inheritance of a trait depends on the passing-on of units.
- For any given trait, an individual inherits one gene from each parent so that the individual has a pairing of two genes.
Thus, the correct answer is opttion A.
Question 9
1 / -0

Normally human offspring can be of two types with XX and .......... chromosomes.

A
XY

B
XX

C
XXX

D
YY

Solution

In humans, sex is determined by sex chromosomes (XX females, XY males).
A female child (44A + XX) is the result of the fertilization of an egg (22 + X) with sperm carrying 22+X chromosomes.
A male child (44A + XY) is the result of the fertilization of an egg (22 + X) with sperm carrying 22+Y chromosomes.
Thus, the offspring can be of two types, XX and XY.
Question 10
1 / -0

A dwarf pea plant is treated with a hormone gibberellic acid. It was found that the plant height increases rapidly. Thus it was conformed that gibberellic acid brings about increase in the height of the plant. If this treated plant is crossed with normal dwarf pea plant, what kind of progeny would you expect?

A
All tall

B
All dwarf

C
50% tall and 50% dwarf

D
75% tall and 25% dwarf

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Heredity and Evolution Test - 18

Result

Heredity and Evolution Test - 18

Score

-

Rank

-

SHARING IS CARING

Question 1

(i) and (ii)

(i) and (iii)

(ii), (iii) and (iv)

(i), (ii) and (iii)

Solution

Question 2

The X chromosome in the zygote

The Y chromosome in zygote

The cytoplasm of germ cell which determines the sex

Sex is determined by chance

Solution

Question 3

Acquired characters do not produce change in the DNA of germ cells.

Acquired characters produce change in the DNA of germ cells.

Acquired characters do not produce change in the DNA of body cells.

All of the above.

Solution

Question 4

Carrot and potato

Carrot and tomato

Radish and carrot

Radish and potato

Solution

Question 5

The sex of the individual is genetically determined.

The sex of the individual is phenotypically determined.

The sex of the individual is physiologically determined.

All of the above

Solution

Question 6

Doubling of chromosomes after zygote formation

Halving of chromosomes during gamete formation

Doubling of chromosomes after gamete formation

Halving of chromosomes after gamete formation

Solution

Question 7

Analogous organs

Vestigial organs

Respiratory organs

Homologous organs

Solution

Question 8

Pairs

Singles

May be paired may be not

All of the above

Solution

Question 9

XY

XX

XXX

YY

Solution

Question 10

All tall

All dwarf

50% tall and 50% dwarf

75% tall and 25% dwarf

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.