In Drosophila, the sex is determined by

  • [AIPMT 2003]
  • A

    Whether the egg is fertilized or develops parthenogenetically

  • B

    The ratio of number of $X$-chromosomes to the sets of autosomes

  • C

    $X$ and $Y$ chromosomes

  • D

    The ratio of pairs of $X$-chromosomes to the pairs of autosomes

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  • [NEET 2016]

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is