Centrioles are the cylindrical, rod-shaped, and microtubular structures that are present in the eukaryotic cells. They are located near the nucleus of the cell. They do not have a limiting membrane as well as DNA and RNA. The centrioles exist in the cells of algae, mosses, ferns, and animals but are absent in the prokaryotic cells and in the cells of flowering plants.
These centrioles are responsible for giving rise to the spindle fibers during the processes of mitosis and meiosis and hence the spindle fibers are known to be the mitotic apparatus. In the case of flagellated and ciliated cells, these spindle fibers are arranged just beneath the cell membrane.
How is an F′ factor different from an F factor?
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
In fruit flies, curved wings are recessive to straight wings,
What is an advantage and a disadvantage of this repair system?
Explain the type of speciation (allopatric, parapatric, or sympatric
The raw material for evolution is random mutation. Discuss whether or
With regard to the timing of conjugation, explain why the recipient
A woman who is heterozygous, Bb, has brown eyes;
A recessive allele in mice results in an unusally long neck.
Why is an antibody used in this experiment? From
