2007-03-04 07:20:34 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
The ovule is an immature seed. It is formed within the ovary and contains the female gametophyte.
The female gametophyte is the embryo sac and forms in the following way.
The megaspore mother cell undergoes meiosis to form 4 haploid (N) megaspores.
One of the 4 will continue to develop, while the other 3 dissolve.
The remaining megaspore grows and its nucleus will undergo 3 mitotic divisions, forming 1 large cell with 8 haploid nuclei.
This will develop into the embryo sac. This sac contains a specific arrangement of these nuclei in the following order: The egg cell is located near the micropyle surrounded by 2 other cells called synergids. At the opposite end 3 antipodal cells are found. In the center of the sac will be found 2 polar nuclei.
2007-03-04 12:48:10 · answer #1 · answered by ATP-Man 7 · 0⤊ 0⤋
The egg nucleus is haploid, as it has the half number of chromosomes that the fertilizing cell completes it.So after fertilization the egg nucleus is diploid.
2007-03-04 08:04:36 · answer #2 · answered by M.Z_Biotech 2 · 0⤊ 0⤋
The egg nuceus is haploid. On joining with the pollen it becomes diploid.
2007-03-04 07:34:48 · answer #3 · answered by science teacher 7 · 0⤊ 0⤋
I've never heard the term 'monoploid' before, but I assume you mean just one of each type of chromosome. An egg is haploid, just like everyone else has said. Haploid is just one of each type of chromosome, instead of diploid, which has chromosomes in pairs.
2007-03-04 08:14:42 · answer #4 · answered by buttercup 3 · 0⤊ 0⤋
monoploid (haploid)
2007-03-04 07:24:08 · answer #5 · answered by ivorytowerboy 5 · 0⤊ 0⤋