Why must all sexually reproducing organisms have both mitosis and meiosis in their life cycles? In other words, what is...
Why must all sexually reproducing organisms have both mitosis and meiosis in their life cycles? In other words, what is the purpose of meiosis AND what is the purpose of mitosis and how are they different? Without sexual reproduction evolution would be extremely slow. Why ? And what stage and steps in meiosis are so important to the genetic variation within a species?
Homework Answers
(i) (a) THE PURPOSE OF MITOSIS:-
- Mitosis is a process where a single cell divides into two
identical daughter cells by cell division.
- During mitosis one cell divides to form two identical
cells.
- The main purpose of mitosis is for cell regeneration, growth, and
asexual reproduction.
(b) THE PURPOSE OF MEIOSIS:-
- the production of gametes for sexual reproduction.
-to reduce the normal diploid cells.
(ii) DIFFERENCE BETWEEN MITOSIS AND MEIOSIS:-
- In both processes the production of new cells takes place.
- Mitosis produces 2 daughter cells which are genetically identical
to the parent cell.
- meiosis produce two gametes fuse to form a zygote, a diploid cell
with the full number of chromosome.
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Under nearly all circumstances, postzygotic reproductive
isolation cannot evolve under the direct action of natural
selection. Instead, postzygotic isolation evolves as a by-product
of other genetic changes as proto-species diverge. In contrast,
natural selection can directly act to enhance prezygotic
reproductive isolation. Consider two species with overlapping
ranges. If hybrids between the species are less fit than pure
species individuals, females that mated with heterospecific males
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offspring had low fitness....
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words:
Q: Compare the assumptions of physician-centered and
collaborative communication. How is the caregiver’s role different
in each model? How is the patient’s role different?
Answer: Physical-centered communication involves the specialists
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discussion and when to end the process. The patient responds to the
issues raised by the caregiver and acts accordingly. On the other
hand, Collaborative communication involves a...
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