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NEETZoologyPrinciples of Inheritance and Variation

A diploid plant species has 14 chromosomes ( 2n = 14 ). Consider the following two independent cellular events: Event 1: Cell A undergoes failure of cytokinesis after telophase of mitosis. Event 2: In a separate individual, failure of segregation of one pair of homologous chromosomes occurs during meiosis. One of the resulting gametes, which carries an extra chromosome, fertilizes a normal gamete to form Zygote B. Wh

Options

  1. A15 and 28
  2. B28 and 14
  3. C15 and 13
  4. D28 and 15

Correct answer

D. 28 and 15

Step-by-step solution

Cell A undergoes mitosis but fails to complete cytokinesis after telophase. This failure results in an increase in a whole set of chromosomes, a condition known as polyploidy. Since the original cell is diploid ( 2n = 14 ), chromosome duplication without cell division results in a tetraploid cell with 4n = 28 chromosomes. Zygote B is formed by the fusion of an abnormal gamete and a normal gamete. The normal haploid gamete has n = 7 chromosomes. The failure of segregation during meiosis (non-disjunction) produces an

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