a) Hox genes appear on the chromosome in the same order in which they are expres
ID: 206660 • Letter: A
Question
a) Hox genes appear on the chromosome in the same order in which they are expressed in the embryo. What is the significance of this?
b) Which cell-level developmental processes can animal cells perform? Which can plant cells perform? What are the implications of this for animal and plant biology?
c) You know what cloning is, but what does it mean – what does cloning demonstrate about cell differentiation?
d) Cloning Dolly the sheep required cells from 2 donors – one donor provided mammary gland cells and one provided an egg. Could the mammary gland cells have been replaced by another kind of cell? Could the egg cell have been replaced by another kind of cell? Why were those two cell types chosen?
Explanation / Answer
The organization and organization of the Hox genes in the chromosome is the same as the order of their expression. This corresponds to their order of expression along anterior-posterior axis and helps in displaying colinearity along the anterior-posterior axis of the developing animal.
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