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NEETZoologyPrinciples of Inheritance and Variation

While constructing a large family tree, a genetic counselor uses a symbol consisting of a diamond with the number '4' written inside it. According to standard pedigree conventions, what does this specific symbol indicate?

Options

  1. AFour unaffected offspring
  2. BFour offspring of unspecified sex
  3. CFour affected individuals of unspecified sex
  4. DFour distinct generations in the family tree

Correct answer

A. Four unaffected offspring

Step-by-step solution

According to standard conventions used in human pedigree analysis, a diamond symbol with a number inside it is used to denote a specific number of unaffected offspring. This is often used to condense a large pedigree chart. Therefore, a diamond with the number '4' inside indicates four unaffected offspring. A plain diamond without a number indicates 'sex unspecified', and affected individuals would be represented by solid (shaded) symbols. Answer: Four unaffected offspring

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