We have learned that crossing over increases the genetic diversity in a populati

Question

We have learned that crossing over increases the genetic diversity in a population because it reshuffles the genes of homologues. Some species have lost the ability to cross over and in other species, like humans, have lost the ability in certain chromosomes. What factors do you think could reduce levels of recombination between homologues? What would you hypothesize to be the control mechanism that would limit crossing over? 9. 10. Many animals show a phenomena known as "point restriction" where they have light fur color over the majority of their body even though their genotype should have dark fur color all over the body. Only in 'restricted' regions of the body such as the extremities (ears, feet, nose) does the dark fur appear. Can your group hypothesis a mode of inheritance for these "point restrictions"?

Explanation / Answer

9. Factors affecting levels of recombination are : Distance between genes more than 50cM.

—> Enzymes concentration - reduced

—> Raised temperature

Control mechanisms are there to reduce over diversity of species

10. Yes, this hypothesis can be grouped as a mode of inheritence for these point restrictions

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