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Heredity and Evolution Test - 34

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Heredity and Evolution Test - 34
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The phenomenon where individuals of a species exhibit differences in characteristics are called:
    Solution
    • The difference between traits in individuals of the same species is known as variation. 
    • Individuals have variations within their heritable traits. Some variations make an individual better suited to survive and reproduce in their environment.
    • The heritable variation comes from random mutations. Random mutations are the initial cause of new heritable traits. For example, a rabbit can't choose to have a different fur colour. Rather, a genetic mutation causes a difference in fur colour, which may help that rabbit hide better in its environment.
    So, the correct option is B.
  • Question 2
    1 / -0
    A pea plant with yellow and round seeds is crossed with another pea plant with green and wrinkled seeds that produced 49 yellow round and 49 yellow wrinkled seeded pea plants. The genotype of parent plant with yellow round seeds must be:
  • Question 3
    1 / -0
    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 $$F_1$$ generation of Mendel's experiment is:
    Solution
    When we cross pure dominant pea plant (round yellow - YYRR) with pure recessive pea plant (wrinkled green - yyrr), in $$F_1$$ generation we get all Yellow round seeds (YyRr) - Heterozygous. So, there will not be any round-green seeds in $$F_1$$ generation. 
    So, the correct answer is (A) - 0.

  • Question 4
    1 / -0
    Among the following which is not one of the direct conclusion that can be drawn from Mendel's experiment?
    Solution
    The conclusions drawn by Mendel based on his experiments on Pea plants resulted in the laws of inheritance, those laws were,
    1. Law of dominance: A cross between contrasting alleles of the same trait will result in progeny ($$F_1$$) expressing only one trait, that is, dominant.
    2. Law of purity of gamete: Every sexually reproducing organism produces gametes which are true for the traits they carry, that is, carry one copy of every trait. The fusion of male and female gametes results in two copies in the progeny.
    3. A recessive trait is always expressed in homozygous condition - example, tt, rr, etc
    4. Natural selection is a concept put forth by Charles Darwin, where nature selects certain traits that are better adapted for survival over others, be it recessive or dominant. Therefore, can alter the frequency of an inherited trait.
    So, the correct answer is 'Natural selection can alter the frequency of an inherited trait.'

  • Question 5
    1 / -0
    The two versions of a trait (character) which are brought in by the male and female gametes are situated on
    Solution
    The two versions of a trait (character) which are brought in by the male and female gametes are situated on - two different chromosomes called homologous chromosomes and represent the diploid state of the cell. The genes representing two versions are called alleles.
    So, the correct answer is 'Two different chromosomes'
  • Question 6
    1 / -0
    How are variations created?
    Solution
    Variations are created because DNA copying mechanism is not accurate.
    The correct option is B.
  • Question 7
    1 / -0
    Inheritance from the previous generation provides
    Solution
    Inheritance from the previous generation provides both a common basic body design and subtle changes in it for the next generation.
    The correct option is C.
  • Question 8
    1 / -0
    The long-term consequence of the accumulation of variations is
  • Question 9
    1 / -0
    Fill in the blank:
    If one bacterium divides, and then the resultant two bacteria divide again, the four individual bacteria generated would be  ____________. 
    Solution
    If one bacterium divides, and then the resultant two bacteria divide again, the four individual bacteria generated would be similar because bacteria divide asexually.
    The correct option is A.
  • Question 10
    1 / -0
    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
    Solution
    Evolution is a gradual process that is the consequence of variations in organisms and takes place gradually.
    The correct option is C.
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