Questions About Diploid

Linda asks…

what is the difference between a diploid and a diploid zygote?

I know a diploid has two sets of chromosome and a haploid has one set, but my book says once two haploids have been fertilized they make a diploid zygote. Is there a difference between a diploid and a diploid zygote?

admin answers:

A zygote is the initial cell after two gametes meet during sexual reproduction. Its a diploid zygote. A diploid can be any cell in the body with a full set of chromosomes.

Ruth asks…

Is the generative nucleus in the pollen of most flowering plants diploid or haploid ?

I know it divides into two, one fusing with the definitive nucleus of the ovule to form a diploid endosperm and the other fusing with the ovum in the ovule to form a diploid zygote.

So, before the generative nucleus divides into two , wouldn't it be diploid (i.e have a diploid number of chromosomes)?

Thanks.

admin answers:

Diploid microspore mother cells inside the anther undergo meiosis (microsporogenesis) forming haploid microspores (each mother cell dividing into four microspores).

The microspores develop into binucleate pollen grains, each containing a tube nucleus and a generative nucleus. Both are haploid . As they develop by meiosis .

When the pollen grain lands on a receptive stigma it grows into an elongate pollen tube containing a tube nucleus and a generative nucleus, the latter of which divides into two haploid sperm nuclei.


More on the link below ,but after clicking scroll down and read , diagrams are included --
http://waynesword.palomar.edu/exm3hint.htm

Sandy asks…

What process is responsible for restoring the diploid number of a species?

1. Meiosis is the process that reduces the number of chromosomes from diploid (2n) to haploid (n). What process is responsible for restoring the diploid number of a species?

admin answers:

Gamete fusion, or zygote formation.

Thomas asks…

What the difference between haploid and diploid?

People say diploid is one set of chromosomes and haploid is two but I still don't get it, I need a real simple explanation. Thanks

admin answers:

Um, no its the other way around. *HA*ploid is *HA*lf.
And DIploid is Double.
A human's haploid is 23 [HAlf of 46 total]
and a human's diploid number is 46 [double of the Haploid, or Half.]

those people dont know what they're talking about:)
hope you understand a little better now.

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