Single Choice

A flower with Tt genotype is cross-pollinated by TT pollens. What will the genotypes of the resulting endosperm and embryo, respectively, be?

A$$TTT, (TT+tt)$$
B$$(TTT+TTt), TT$$
CTTt, Tt
D$$TTt, (TT+Tt)$$
Correct Answer

Solution

Two male gametes are produced by the pollen grain One fuses with the egg cell to form the zygote and the other fuses with 2 polar nuclei to form the diploid zygote. The genotype of the pollen is TT. It fuses with the ovum to form the embryo that can have a genotype TT or Tt. The 2 polar nuclei Tt will have the gametes T and t respectively. Hence on fusion with a male gamete, the genotype of the endosperm will be TTt. Thus the correct answer is option D.

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