Table of Contents
- 1 How many spindle Apparatuss are needed?
- 2 How many spindle apparatus are formed during mitosis?
- 3 How many spindle apparatus are required for mature female gametophyte?
- 4 How many mitotic divisions are required for 400 seeds?
- 5 In which phase of mitosis spindle apparatus is produced?
- 6 How spindles are formed in plants?
How many spindle Apparatuss are needed?
2s secondary spermatocyte undergo meiosis-ll ( 1spindle in each) involving 2 spindles to form 4 sperms. Hence, 3 spindles apparatus required to form 4 sperms.
How many meiosis and mitosis are required for the formation of 400 male gametes in rice?
One meiotic division produces 4 male gametes, so for the formation of 400 male gametes 100 meiotic divisions are required.
How many spindle apparatus are formed during mitosis?
The mitotic spindle is a structure that forms during cell division and separates duplicated chromosomes. In eukaryotic cells, the mitotic apparatus is composed of two centrosomes and spindle microtubules (Figure 43.9).
Do plants have spindle apparatus?
Plant cells lack centrioles but still, they are capable to form a mitotic spindle from the centrosome area of the cell located just exterior to the nuclear envelope.
How many spindle apparatus are required for mature female gametophyte?
So total number of spindles is 3.
How many spindle Apparatii are formed during the formation of 60 Microspores?
by Biology experts to help you in doubts & scoring excellent marks in Class 11 exams….
| Question | Number of spindle apparatus formed during the formation of one hundred microspores from microspore mother cells is |
|---|---|
| Type of Answer | Video & Text |
How many mitotic divisions are required for 400 seeds?
500 meiotic divisions
Complete answer: The formation of the male gamete requires only one meiotic division which results in four male gametes while the formation of four female gametes requires four meiotic divisions. So, the five meiotic divisions result in four seeds thus 500 meiotic divisions result in 400 seeds.
How many meiotic divisions are required for formation of 400 seeds in pea?
5 meiotic divisions are needed for the formation of 4 seeds and 500 meiotic divisions are required for the formation of 400 seeds.
In which phase of mitosis spindle apparatus is produced?
Prophase
Prophase starts with condensation of chromosomes into sister chromatids. It is the most important event of prophase. Prometaphase starts abruptly with breakdown of nuclear membrane. Formation of spindle apparatus occurs during this stage.
How many types of spindles are there?
There are 2 types of spindle fibres which are identified – the interpolar fibre, stretching continuously from one to another of the spindle; kinetochore fibre.
How spindles are formed in plants?
At the initial stages of karyokinesis, two centrioles (wheel-shaped) take positions at opposite sides of a cell, forming poles. The microtubules extend from centrioles to every direction possible, forming a spindle. Some of them attach the poles to the kinetochores around the centromere.
Does spindle formation occur in plants?
Plant cells lack such structured microtubule organizing centers, and some of their microtubules appear to nucleate from near the nuclear envelope, but very little is known about spindle formation in plants (reviewed in Bannigan et al., 2008). …