How many pairs of chromosomes are there in a normal human body cell?
| 1 |
| 23 |
| 4 |
| billions. |
Who wrote On the Origin of Species by Means of Natural Selection, or The Preservation of Favored Races in the Struggle for Life, the classic work providing the foundation for the development of modern evolutionary thought?
| William Darwin. |
| Charles Darwin. |
| Thomas Darwin. |
| Robert Darwin. |
According to proponents of "natural theology," an adapted organism is like:
| the British Parliament, with the head ruling like the House of Lords, and the genitalia ruling like the House of Commons. |
| God, only smaller and weaker. |
| a political state, constantly navigating between competition (war) and cooperation (peace). |
| a precision crafted instrument, like a watch. |
The reason sickle cell anemia is so prevalent among Africans is:
| a high mutation rate among Africans. |
| polygynous social structure in Africa. |
| the heterozygote is protected against malaria, but does not breed true. |
| the first, original African person had sickle cell anemia. |
23 pairs
Human cell contain 23 pairs of chromosome , out of 23 pairs 22 pairs are autosomes and 1 pair sex chromosomes (XX or XY).
Charles Darwin.
Charles Darwin wrote the origin of species by means of natural selection or, The preservation of favoured races in the struggle for life. He gave a huge contribution in evolutionarily biology.
God, only smaller and weaker.
Natural theology is well accepted in 18th cebcent before Darwin theory. The difference between these two theories are natural theology consider supernatural selection (God) where as in Darwin's theory it said about natural selection.
The heterozygote is protected against malaria,but does not breed true.
Sickle cell anemia are prevalent in Africa because in Africa malaria is also a prevalent disease among the people. It was shown that who are heterogeneous in SicjlS cell anemia are protected from malaria. So, in evolutionary adaptation sickle cell anemia is prevalent in African although truee homozygous condition are rare.
Thank you.......
How many pairs of chromosomes are there in a normal human body cell? 1 23 4...