Which molecular interaction is crucial for early posterior determination in the Drosophila egg?
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a
Interaction between nurse cells and the oocyte
b
Interaction between terminal follicle cells and the oocyte
c
Interaction between Gurken and Torpedo proteins
d
Interaction between Bicoid and Hunchback proteins
e
There is no early posterior signal in Drosophila egg
b
Interaction between terminal follicle cells and the oocyte
The correct answer is:
a
Interaction between nurse cells and the oocyte
To find the answer to this question, we need to understand the process of early posterior determination in the Drosophila egg.
In Drosophila, the localization of specific molecules at different positions within the egg plays a crucial role in early development. One such molecule is the mRNA (messenger RNA) of a protein called Oskar, which is important for posterior determination.
During oogenesis (the process of egg development), Oskar mRNA is localized at the posterior end of the developing egg. This localization is achieved through an interaction between nurse cells and the oocyte.
The nurse cells, which surround the oocyte, contain Oskar mRNA. They transport this mRNA to the posterior end of the oocyte, where it gets anchored. This interaction between nurse cells and the oocyte is crucial for the establishment of posterior determination in the Drosophila egg.
Therefore, the correct answer to the question is option a: Interaction between nurse cells and the oocyte.