1.What causes variation in a species? To put this another way: all humans have t

Question

1.What causes variation in a species? To put this another way: all humans have the same genes, yet we do not look alike. What is the reason for thephenotypicdifferences between individuals of the same species? What is genetic recombination?

2. What are the dangers of small populations of a species from a genetic and evolutionary standpoint? What is the bottleneck effect?

3.. How does speciation occur? What is the importance of geographic isolation? How is this illustrated in the Galapagos?

4. What is Darwinian Medicine and how does it help us better understand medical conditions?

Explanation / Answer

1. variation are caused due to primarily polymorphism, mutation and crossing over. though the total chromosomal content in all the human beings are same, there exist enormous polymorphisms in genes. these polymorphis variations are called alleles. single nonsense mutations which doesnot cause any aminoacid change, may result in differences in interactions at quertianary sturctural levels.crossing over also result random rearrangement of alleles in sister chromatids of parents also during meiosis. these are the causes of phenotypic differences

2.small population size may lead to genetic drift due to loss of allelic variation, diversity.this is known as botteleneck effect. limited population size and species diversity will reduce the variation after crossingover. from evvlutionary view point it is critical because adaptation to harse natural environment requires some rare alleles which might not be required in normal. thus small population size may restrict evolution of new species adaptated to changes environment.

3. speciation is formation of new species which occurs due to geographical isolation and forces of natural selection or genetic drift.geographis isolation causes new natural forces to act on the isolated species thus have dominant role for speciation.Galapagos are the breeds of bird which darwin studied for understanding speciation

4.darwanian medicine applies the evolutionary theories of darwin to understand health and medicine especially what are the causes of sickness in human

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.