MCQ
Analogous structures are a result of:
  • A
    Convergent evolution.
  • B
    Divergent evolution.
  • Shared ancestry.
  • D
    Stabilizing selection.

Answer

Correct option: C.
Shared ancestry.
Shared ancestry.

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Transgenic animals can serve as factories that in some cases, may produce large amount of proteins more efficiently. Transgenic mice have been engineered to express human antibodies by introducing large segment of human $\text{DNA}$ encoding human immunoglobulin genes. In transgenic large animals such as cow or sheep proteins of pharmaceutical value can be produced in large quantities in milk which is later purified. Transgenesis can be used to alter many phenotypic properties including growth rate, fat composition, milk production, hair texture, etc.
  1. The production of transgenic animals includes
  1. Identification and separation of desired gene.
  2. Combining the desired gene with appropriate vector.
  3. Introduction of vector in cells, tissues or embryos.
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  1. In transgenic animals, i.e., cow and sheep proteins of pharmaceutical value are produced in large quantities in the
  1. Blood.
  2. Accumulated fat.
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  1. Mouse is mostly preferred animal for studies on gene transfer because.
  1. Short oestrous cycle.
  2. Long gestation period.
  3. Short generation time.
  4. Production of one or two offspring per pregnancy.
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  2. Both $(A)$ and $(B)$
  3. Only $D$
  4. Both $(C)$ and $(D).$
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  2. Fat composition.
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  1. Assertion: Transgenic mice have been engineered to express human antibodies.
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