MCQ Questions for Class 10 Biology Heredity And Evolution Quiz 11

On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in

F_{1}

$F_1$ generation. What will be the respective number of tall and dwarf plants obtained in the

F_{1}

$F_1$ generation?

0%
375, 125
0%
250, 250
0%
475, 25
0%
350, 150

In a dihybrid cross,

f_{2}

$f_2$ generation offsprings show four different phenotypes, while the genotypes are of .......... types.

0%
Six
0%
Nine
0%
Eight
0%
Sixteen

A man having the genotype EEFfGgHH can produce P number of genetically different sperms, and a woman of genotype IiLLMmNn can generate Q number of genetically different eggs. Determine the values of P and Q.

0%
P = 4, Q = 4
0%
P = 4, Q = 8
0%
P = 8, Q = 4
0%
P = 8, Q = 8

Explanation

Types of gametes =

2^{n}

$2^n$ ; where n is the number of heterozygous loci.

Here, the man has 2 heterozygous loci

Therefore, man will produce

2^{2} = 4

$2^2 \, = \, 4$ types of gametes.

And, the woman has 3 heterozygous loci

Therefore, she will produce

2^{3} = 8

$2^3 \, = \, 8$ types of gametes.

Thus, the values of P=4 and Q=8

So, the correct answer is option B.

Choose the correct answer from the alternatives given.

In a certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.
Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?

0%
9:3:3:1 Ratio of Phenotypes only
0%
9 : 3: 3: 1 Ratio of Genotypes only
0%
1: 1: 1: 1 Ratio of Phenotypes only
0%
1: 1: 1: 1 Ratio of Phenotypes and Genotypes

In garden pea plant, a pure line with round seeds(RR) is crossed with a pure line having wrinkled seeds (rr). The ratio of round seed plants to wrinkled seed plants in

F_{2}

$F_2$ generation will be?

0%
$1:2$
0%
$2:1$
0%
$1:3$
0%
$3:1$

Explanation

A cross between homozygous round seeds plant (RR) and homozygous wrinkled seeds plant (rr) will produce heterozygous (Rr) round seeds plants as F1 generation. The selfing of $F_1$ will give $F_2$ generation, where there will be one homozygous dominant round seed plant (RR), two heterozygous round seed plants (Rr) and 1 homozygous recessive wrinkled seed plant (rr). Phenotypically, there will be 3 round seed plants and 1 wrinkled seed plant. Hence, the correct answer is ‘3:1’.

In pea plants, the long stem trait 'S' is dominant and the short stem trait 's' is recessive. Two pea plants were crossed, producing seeds that yielded 165 long stem plants and 54 short stem plants. The genotypes of the parent plants that was most likely is?

0%
Ss and SS
0%
Ss and Ss
0%
ss and ss
0%
SS and ss

Which one of the Mendel traits of Pea was recessive

0%
Tall height
0%
Green pod
0%
Green seed colour
0%
Round seed.

The genotype for the height of an organism is 'Tt'. What conclusion can be drawn from this?

0%
The allele for height has at least two different genes.
0%
There are at least two different alleles for the gene controlling height.
0%
There are two different genes for height, each having a single allele.
0%
There is one allele for height with two different forms.

A tall plant obtained by crossing a homozygous tall and dwarf plants was grown in nutrient-deficient soil. The plant remained dwarf. When this plant was crossed with a dwarf plant, then:

0%
All plants are dwarf
0%
All plants are tall
0%
50% tall and 50% dwarf plants obtained
0%
75% tall and 25% dwarf plants obtained

Explanation

First, the cross between homozygous tall

(T T)

$(TT)$ and the homozygous dwarf

(t t)

$(tt)$ plant will result in 4 tall plants with heterozygous genotype

(T t)

$(Tt)$ . But, since they were grown in nutrient-deficient soil, they remained as dwarf plants.

These plants were then crossed with another dwarf plant

(t t)

$(tt)$ . Such a cross is called a test cross. In this cross, 50% of plants obtained are tall, which are heterozygous dominant genotype

T t

$Tt$ (50%). There was also 50% dwarf plants, with homozygous recessive genotype

t t

$tt$ . No homozygous dominant genotypes

(T T)

$(TT)$ were obtained.

i.e. Genotypic and phenotypic ratio is 1:1.

So, the correct option is D.

2095112_972972_ans_efb9acc8dbc24cc2af7cf7034bf94640.jpg

Which of the following terms are defined correctly?

	Term	Definition
i	Heredity	The passing on of characteristic from parents to their young.
ii	Life cycle	The different stages of development of a living thing from a fertilised egg to an adult that can reproduce and die eventually.
iii	Reproduction	The fusion of a sperm and an egg.

0%
i and ii only
0%
i and iii only
0%
ii and iii
0%
i ii and iii

A homozygous tall plant was grown in nutrient deficient soil and remained dwarf. When it is crossed with dwarf plant then?

0%
All hybrid plants are dwarf
0%
All hybrid plants are tall
0%
$50\%$ tall and $50\%$ dwarf
0%
$75\%$ tall and $25\%$ dwarf

The ability to walk upright on two legs is called___________.

0%
bipedalism
0%
quadropedalism
0%
bicyclopedalism
0%
tripedalism

In Peas, a pure tall plant (TT) is crossed with a short plant (tt). the ratio of pure tall plants to short plants in

F_{2}

$F_2$ is?

0%
1 : 3
0%
3 : 1
0%
1 : 1
0%
2 : 1

Explanation

In garden Pea if a pure tall (TT) plant is crossed with a pure dwarf (tt), the ratio of Pure tall (TT) to short (tt) plant in the F

_{2}

$_2$ generation is 1:1

So, the correct answer is '1 : 1'

1648168_1773868_ans_aa35ca0ad892467f918829ae9593636c.jpg

State whether the given statement is True or False:
Human beings are the pinnacle of evolution.

0%
True
0%
False

Among the seven pairs of contrasting traits in pea plant as studied by Mendel, the number of traits related to flower, pod and seed respectively were

0%
2, 2, 2
0%
2, 2, 1
0%
1, 2, 2
0%
1, 1, 2

State whether the given statement is True or False:
A bird species with short beak will always have a short beak for generations, even if it has a difficulty in catching worms.

0%
True
0%
False

CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 11 - MCQExams.com

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Gametes	S	s
S	SS	Ss
s	Ss	ss

CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 11 - MCQExams.com

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Practice Class 10 Biology Quiz Questions and Answers

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