Question

As this bee dines on nectar, it also transfers pollen from one flower to another. Pollen containing sperm is transferred to the female flower parts and fertilization of an egg soon follows.
Which statement BEST summarizes the change in chromosome number before and after fertilization?












A) N + N yields N


B) N + N yields 2N


C) N + 2N yields 3N


D) 2N + 2N yields 4N

Answer 1

The right answer is B) N + N yields 2N  

During this crossing, the vegetative nucleus degenerates, while the reproductive nucleus (n chromosomes) divides into 2 male nuclei or spermatozoa, each with n chromosomes. These are the male gametes of flowering plants.

One of the spermatozoa unites with the oosphere and gives the zygote (at 2n).

After this fertilization, the egg is transformed into seed while the ovary develops into fruit containing one or more seeds. The other parts of the gynoecium and the flower usually disappear.

Answer 2

B) N+N YIELDS 2N
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