Endosymbiosis theory states that a few organelles i.e. mitochondrion and chloroplast which are present in today’s eukaryotic cell once belonged to the prokaryotic microbes. According to this theory, the first-ever eukaryotic cell was like an amoebic cell which used to get its nutrients by the process of phagocytosis. Its nucleus was formed as a result of pinching off of the cytoplasmic membrane.
These cells ingested some prokaryotes that had the ability to survive within and develop a symbiotic relationship. When the bacteria having the capability of respiring aerobically was ingested by the amoebic cell, a mitochondrion was formed. On the other hand, when the photosynthetic bacteria were taken up by the cell, the chloroplasts were formed. Gradually, both the organelles lost much of their genetic material as well as their cell walls.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
