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Heredity and Evolution Test - 28

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Heredity and Evolution Test - 28
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Any heritable feature is a:
    Solution
    In biological terms, a character can be defined as any heritable feature that varies among individuals. For example, flower colour. Traits are the alternative forms of the character. For example, the purple or white colour of the flower are the traits. 
  • Question 2
    1 / -0
    How many X chromosomes are present in a male?
    Solution
    There is one X chromosome present in a male. Sex pair of chromosome XY represents the male human.
  • Question 3
    1 / -0
    Heredity is seen in ______
    Solution
    Transfer of genetic makeup from one generation to another is called heredity. Genes are found on DNA and thus, all living beings have a tendency to transfer DNA during sexual or asexual reproductions.
  • Question 4
    1 / -0
    A cross between two tall garden pea plants produced all tall plants. The possible genotypes of the parents are
    I) TT, TT
    II) TT, Tt
    III) Tt, tt
    IV) Tt, Tt
    Solution
    If the offsprings produced are all tall plants, then the possible genotypes will be:
    1. TT x TT (which will result in all tall plants with genotype TT)
    2. TT x Tt (which will result in tall plants with genotype TT (3 plants) and one with genotype Tt (which will also be phenotypically tall).
    Thus, the correct answer is option (C).
  • Question 5
    1 / -0
    Read the two incidents given below.
    Incident 1: A species of moth is preyed on by bats. Over hundreds of years, the moths develop a sophisticated pattern of flying when they hear the screech of a bat and which helps them escape danger. Other changes occur as well, when current moth mates with its ancestor moth, no viable eggs are produced. 
    Incident 2: A species of frogs is living in a pond near an earthquake fault line. An earthquake separates the frog population into two separate populations. After hundreds of years, the two population are not able to mate.

    Based on the second incident, mating between two groups of frogs is not possible as they have now become different:
    Solution
    Species is a group of individuals that can potentially interbreed to produce fertile offspring. The geographical isolation of two population prevented gene flow among them and accumulation of genetic variation with time diverged then into two different species which are no longer able to interbreed. 
    So, the correct answer is option C.
  • Question 6
    1 / -0
    The heart of mammals and birds is four-chambered, while fishes have two-chambered hearts and amphibians and reptiles have three-chambered hearts. The hearts of birds and mammals are:
    Solution
    Organs that are structurally similar and functionally different are called homologous organs. The hearts of birds and mammals show similarities in the basic structure (possess 4 chambers), but functionally the heart of humans is more complex than birds. 

  • Question 7
    1 / -0
    What is true about the genotypes of offsprings produced as a result of cross between a pea plant with genotype YY that produces yellow seeds and a pea plant with genotype yy that produces green seeds?
    Solution
    A monohybrid cross is a mating between two individuals with different alleles at one genetic locus of interest. 
    The cross between YY that produces yellow seeds and yy that produces green seeds will produce plants having genotype Yy.
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    In his theory of natural selection, Charles Darwin suggested "survival of fittest" as basis of organic evolution. The correct explanation for "survival of fittest" is
    Solution
    According to Darwin, fittest individuals are the ones that have characters rendering them reproductively success i.e., ability to produce maximum number of offsprings by random mating and leave fertile offsprings.
    Therefore, the correct answer is option C.
  • Question 9
    1 / -0
    The Punnett square below shows a cross between a pure tall and heterozygous tall plant. What will be the percentage of tall offspring?

     GameteT  T
    T TTTT 
     tTt Tt 
    Solution
    Cross is shown between a pure tall (TT) and heterozygous tall plant (Tt) and it produces TT:Tt in the ratio of 1:1. T is dominant and t is recessive (dominant trait will mask the effect of the recessive trait). Therefore, TT and Tt both are tall plants and there are no short plants. 
    Therefore, the correct answer is option A.
  • Question 10
    1 / -0
    Trait that masks the other trait is called _______ trait.
    Solution
    The trait that is always expressed and masks the effect of other traits is called a dominant trait. They are expressed in both homozygous as well as heterozygous conditions.
    For example, T is for tall and t is for dwarf. If T is dominant to t, TT will be tall and Tt will also be tall.
    So, the correct answer is option A.
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