Formation of female gametes, Biology

Assignment Help:

Formation of female gametes:

  1. Ovule develops from a cushion like part of the ovary called the PLACENTA. Ovule is connected to the placenta by a stalk known as FUNICLE.
  2. The tissue enclosed inside the ovule is NUCELLUS. It is surrounded by two coverings or INTEGUMENTS which leave a small pore known as MICROPYLE.
  3. Basal part of ovule where the two integuments arise is known as CHALAZA.
  4. From the cells of the nucellus, one cell differentiates as MEGASPORE MOTHER CELL which is diploid (2n).
  5. The megaspore mother cell divides by meiosis to form four megaspores out of which only one develops as embryo sac. This is haploid and is also called Female Gametophyte.
  6. At the time of fertilisation there will be a total of 7 cells arranged in three groups in a mature embryo sac.
  7. They are one egg, two synergids, one central cell three antipodals.
  8. While all the cell are in haploid condition only the secondary nucleus is diploid.

Related Discussions:- Formation of female gametes

What are the different radiographic techniques, Q. What are the different r...

Q. What are the different radiographic techniques used for assessing osseointegration? The different radiographic techniques used to assess osseointegration prior to stage 2 su

What do you mean by binomial nomenclature, Q. What do you mean by Binomial ...

Q. What do you mean by Binomial nomenclature? Binomial nomenclature is the naming of the individual entity and the group so produced through classification, according to the in

Describe retroviruses and how do they reproduce, Q What are the retroviruse...

Q What are the retroviruses? How do they reproduce and what is the role of the enzyme reverse transcriptase? Retroviruses are viruses whose genetic material is RNA, HIV and the

INVERTEBRATES - STRUCTURE & FUNCTION, 2. Describe the respiratory organs a...

2. Describe the respiratory organs and mechanism of respiration in pila.

What are the two big groups into which cells are classified, Cells are clas...

Cells are classified into eukaryotic or prokaryotic. Prokaryotic cell is that with no a delimited nucleus. Eukaryotic cells are those with nucleus delimited by membrane.

What is the speech perception test, What is the Speech Perception Test ...

What is the Speech Perception Test The subject is asked to listen to a series of 60 sounds, each of which consists of a double e digraph with varying prefixes and suffixes. The

Cell biology, is the study of internal structure of cell included in cell b...

is the study of internal structure of cell included in cell biology or anatomy?

Pollution - environmental pollution, Pollution - Environmental Pollution ...

Pollution - Environmental Pollution Pollution refers to any undesirable change in the physical, chemical or biological characteristics of our environment, i.e. air, water and

Autumn (fall) overturn, Autumn (fall) overturn In autumn or early wint...

Autumn (fall) overturn In autumn or early winter the air temperature falls, resulting in the cooling of the surface waters. When the surface water cools to 4°C it becomes dens

How does the excretory system of nematodes work, How does the excretory sys...

How does the excretory system of nematodes work? The metabolic residuals of nematodes are collected by two longitudinal lateral excretory channels that open in one excretory po

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd