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CBSE Questions for Class 10 Biology Heredity And Evolution Quiz 9 - MCQExams.com

A pure dominant pea plant producing round yellow seeds is crossed with pure recessive pea plant producing wrinkled green seeds. The number of plants bearing round green seeds in the F1 generation of Mendel's experiment is:
  • 0
  • 1
  • 3
  • 9
Among the following which is not one of the direct conclusion that can be drawn from Mendel's experiment?
  • Only one parental trait is expressed in F1 generation.
  • Two copies of each trait is inherited in sexually reproducing orgainsm
  • For recessive trait to be expressed, both copies should be identical.
  • Natural selection can alter frequency of an inherited trait.
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
  • Copies of the same chromosome
  • Two different chromosomes
  • Sex chromosomes
  • Any chromosome
The phenomenon where individuals of a species exhibit differences in characteristics are called:
  • Evolution
  • Variation
  • Adaptation
  • All of the above
State whether the given statement is True or False:
Sexual reproduction has more inaccuracies than asexual reproduction.
  • True
  • False
How are variations created?
  • Because DNA copying mechanism is 100% accurate
  • Because DNA copying mechanism is not accurate
  • Because transcription of mrna from DNA is not accurate
  • Both A and B
State whether the given statement is True or false:
All the variations in a species have equal chances of surviving in the environment in which they find themselves.
  • True
  • False
The long-term consequence of the accumulation of variations is
  • Evolution
  • Adaptation
  • Inability to reproduce
  • Recombination 
Inheritance from the previous generation provides
  • Only a common basic body design
  • Only subtle changes in it in the common body design
  • Both A and B
  • None of the above
Fill in the blank:
If one bacterium divides, and then the resultant two bacteria divide again, the four individual bacteria generated would be  ____________. 
  • Similar
  • Different
  • Similar in only few properties
  • Similar in external appearance.
State whether the given statement is True or False:
Variations do not promote survival of a species.
  • True
  • False
The sequence of gradual changes which takes place in the primitive organisms over millions of years in which new species are produced is known as
  • Inheritance
  • Variation
  • Evolution
  • None of the above
State whether the given statement is True or false:
The second generation will have differences that they inherit from the first generation, as well as newly created differences.
  • True
  • False
How long did it take for humans to split from chimpanzees and become our current species?
  • 7 million years
  • 1 million years
  • 2 million years
  • 13 million years
What is the scientific name for modern day humans?
  • Homo Habilis
  • Homo Sapiens
  • Homo Erectus
  • None of the above
Which of the following is true about chromosomes?
  • Separate independent pieces responsible for variations is called a chromosome.
  • Each cell will have two copies of each chromosome, one each from the male and female parents.
  • Two germ cells combine to restore the normal number of chromosomes in the progeny.
  • All of the above.
With whom can you associate the theory of evolution?
  • Stanley Miller
  • Charles Darwin
  • Gregor Mendel
  • None of the above
What are the main theories about how humans got to the America?
  • Humans went by planes.
  • Humans were always in the America.
  • Humans walked across the continent of Pangea.
  • None of the above
The only progressive trend in evolution seems to be that more and more ____________ body designs have emerged overtime.
  • Complex
  • Simple
  • Both A and B
  • None of the above
The characteristics of the second generation organisms produced asexually will be
  • Comparatively similar
  • Completely similar
  • Some will be unique while others will be similar due to inheritance
  • All of the above
In Mendel's experiments with the garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow seed colour (YY) was dominant over green seed colour (yy). What are the expected phenotypes in the F2 generation when RRYY is crossed with rryy?
  • Only wrinkled green seeds
  • Round yellow seeds, round green seeds, wrinkled yellow seeds, and wrinkled green seeds
  • Only round green seeds
  • Only wrinkled yellow seeds
In a cross between a homozygous tall pea plant with green pod (TTGG) and a homozygous short plant with yellow pod (ttgg), how many short plants out of 16 you would expect in F2 generation?
  • 3
  • 4
  • 9
  • 1
Organisms phenotypically similar but genotypically different are said to be
  • Heterozygous
  • Monozygous
  • Multizygous
  • Homozygous
A woman has only daughters. Which of the following is the suitable explanation for it?
  • The man produces sperms with either X and Y chromosomes but only the sperms with Y chromosomes are viable.
  • The man produces sperms with either X and Y chromosomes but only the sperms with X chromosomes are viable.
  • The man produces sperms with either X and Y chromosomes and all are viable.
  • The man produces sperms that have only X chromosomes and all are viable.
If in a garden pea plant, a cross is made between red-flowered (RR) and white-flowered (rr) plants. What will be the phenotypic ratio in F2 generation?
  • 1 : 2 : 1
  • 9 : 3 : 3 : 1
  • 3 : 1
  • 1 : 3
In human beings, the statistical probability of getting either a male or a female child is 50:Which of the following is the cause behind it?
  • The sex of an infant is determined by the type of sex chromosome contributed by the male gamete.
  • The ratio of male gametes containing X chromosome and those containing Y chromosome is 50:50.
  • Both A and B.
  • None of these
Both the parents contribute equal amount of ................. material to the offspring.
  • Genetic
  • RNA
  • Phenotypic
  • None of the above
Which of the following is the reason for the appearance of new combinations of characters in the F2 progeny?
  • The tall/short and round/wrinkled seed traits are independently inherited
  • The tall/short and round/wrinkled seed traits are not independently inherited
  • The tall/short and round/wrinkled seed traits are linked
  • None of these
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have a new combination of characters. Choose the new combination from the following.

(i) Round, yellow
(ii) Round, green
(iii) Wrinkled, yellow
(iv) Wrinkled, green
  • (i) and (ii)
  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (iii)
What are the differences between inherited and acquired characters?
  • Inherited characters - Characters that are passed on from parents to offspring.
    Acquired characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation.
  • Inherited characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation.
    Acquired characters - Characters that are passed on from parents to offspring.
  • Inherited characters - Characters appearing in an individual's lifetime and can be transmitted to next generation.
    Acquired characters - Characters appearing in an individual's lifetime but cannot be transmitted to next generation.
  • Inherited characters - Characters that are passed on from offspring to parents.
    Acquired characters - Characters appearing in an individual's lifetime and can be transmitted to next generation.
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