Heredity and Evolution Test

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Heredity and Evolution Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

A pure tall and a pure dwarf plant were crossed to produce offsprings. If offsprings were self crossed, then the ratio between true breeding tall to true breeding dwarf would be

A
1 : 1

B
3 : 1

C
2 : 1

D
1 : 2 : 1

Solution

Pure tall crossed with pure dwarf: TT x tt ---> Tt (F$$_{1}$$ generation - Tall)
Selfing of F$$_1$$: Tt X Tt
Fusion causes: TT (Tall), Tt (Tall), Tt (Tall) and tt (Dwarf)
Ratio between true breeds ----> TT : tt = 1 : 1
Question 2
1 / -0

In the event of crossing of a homozygous tall plant with a dwarf plant, plants in the F2 generation would be

A
All homozygous dwarf

B
All heterozygous tall

C
One homozygous tall, one homozygous dwarf and two heterozygous tall

D
Two tall and two dwarf

Solution

Crossing for F$$_1$$ : TT X tt
F$$_1$$ offspring :   Tt
Selfing of F$$_1$$:   Tt X Tt
Gametes:    T, t T, t
Fusion: Tt (Heterozygous tall), TT (Homozygous tall), Tt (Heterozygous tall) and tt (Homozygous dwarf).
Question 3
1 / -0

In a monohybrid cross, when an F$$_{1}$$ plant is crossed with a homozygous dominant parent, the offspring will be:

A
Dominant : recessive in the ratio 3:1

B
Only recessive plants

C
Dominant : recessive in the ratio 1:1

D
No recessive plants

Solution

The genotype of a tall plant in the $$F_1$$ generation of a monohybrid cross is $$Tt$$. When it is crossed with a dominant parent with genotype $$TT$$, the crossing can be shown as described in the given Punnett square.

The crossing produces offspring with genotypes $$TT$$ (Homozygous dominant) and $$Tt$$ (Heterozygous dominant). Hence all offspring will contain the dominant allele and hence there won't be recessive offspring.

So, the correct answer is option D.
Question 4
1 / -0

Which of the following is a recessive trait according to Mendel's experiment?

A
Round seed

B
Wrinkled seed

C
Axial flower

D
Green pod

Solution

Mendel worked with the common garden pea plant, Pisum sativum. In his experiment, he chose to follow seven visible features or characters each represented by two contrasting forms or traits as shown in the table. Hence, the recessive trait is the 'wrinkled seed'.
So, the correct answer is 'B'.
Question 5
1 / -0

Based on the concept of Mendel's law of segregation, the germ cells always receive:

A
One pair of alleles

B
One quarter of the genes

C
One of the paired alleles

D
Any pair of alleles

Solution

As per Mendel's principle of segregation, germ cells (i.e. sex cells or gametes) always receive one of the paired alleles. The segregation of the allele is also independent of any other factors, as explained by the law of independent assortment. This means that the gametes will have one of the paired alleles responsible for each gene.
So, the correct answer is C.
Question 6
1 / -0

Who wrote the book "Origin of Species"?

A
G.J. Mendel

B
Lamarck

C
Hugo de Vries

D
Charles Darwin

Solution

Charles Darwin was known for his major contributions in the field of evolutionary biology. He published "Origin of Species", on 24 November 1859. It supports the evidence of evolution through a common branching pattern.
Question 7
1 / -0

There is more competition for survival between:

A
Similar species occupying same niche

B
Different species occupying same niche

C
Similar species occupying different niche

D
Different species occupying different niche

Solution

Similar species occupying the same niche will have similar requirements, hence, there will be more competition. If organisms have different requirements or they occupy different niches, then competition will be less.
So, the correct answer is option A.
Question 8
1 / -0

Which of the following depicts Mendel's dihybrid ratio?

A
3 : 1

B
9 : 3 : 3 : 1

C
9 : 7

D
15 : 1
Solution
- A dihybrid cross is a cross between F$$_1$$ offspring (first-generation offspring) of two individuals that differ in two traits of particular interest.
- For example : RRyy/rrYY or RRYY/rryy parents result in F$$_1$$ offspring that are heterozygous for both R and Y (RrYy). Thus, Mendel's dihybrid ratio is depicted by 9:3:3:1.
- So, the correct answer is option B.
Question 9
1 / -0

Homologous organs are :

A
Leg of man, leg of horse, wing of bat.

B
Hand of man, tail of horse, wing of bat.

C
Hand of man, forelimb of horse, wing of bat.

D
Hand of man, leg of horse, wing of bat.

Solution

Homologous organs are those that have similar structures and share common ancestors but have different functions e.g., the wings of a bat for flight, the lateral fin of a whale for swimming, and the human arm to hold or lift any object. Thus, the correct answer is option C.
Question 10
1 / -0

Wings of a bird and forelimbs of a horse are:

A
Analogous organs

B
Homologous organs

C
Vestigial organs

D
Both A and C
Solution
Homologous organs are those organs that have originated from the same basic structure but perform different functions.
Example: The wings of birds and forelimbs of the horse originated from a similar structure but use them differently. Thus, these structures are homologous structures.
So, the correct answer is (B).

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Re-Attempt Weekly Quiz Competition

Heredity and Evolution Test - 15

Result

Heredity and Evolution Test - 15

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SHARING IS CARING

Question 1

1 : 1

3 : 1

2 : 1

1 : 2 : 1

Solution

Question 2

All homozygous dwarf

All heterozygous tall

One homozygous tall, one homozygous dwarf and two heterozygous tall

Two tall and two dwarf

Solution

Question 3

Dominant : recessive in the ratio 3:1

Only recessive plants

Dominant : recessive in the ratio 1:1

No recessive plants

Solution

Question 4

Round seed

Wrinkled seed

Axial flower

Green pod

Solution

Question 5

One pair of alleles

One quarter of the genes

One of the paired alleles

Any pair of alleles

Solution

Question 6

G.J. Mendel

Lamarck

Hugo de Vries

Charles Darwin

Solution

Question 7

Similar species occupying same niche

Different species occupying same niche

Similar species occupying different niche

Different species occupying different niche

Solution

Question 8

3 : 1

9 : 3 : 3 : 1

9 : 7

15 : 1

Solution

Question 9

Leg of man, leg of horse, wing of bat.

Hand of man, tail of horse, wing of bat.

Hand of man, forelimb of horse, wing of bat.

Hand of man, leg of horse, wing of bat.

Solution

Question 10

Analogous organs

Homologous organs

Vestigial organs

Both A and C

Solution

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