Some individuals contain alternate versions of specific genes (alleles) that make them resistant to particular diseases. for example, people with certain globin alleles are resistant to malaria, and some people cannot be infected with hiv because, genetically, they lack the co-receptors that the virus needs to enter cells. this phenomenon might make which of koch's postulates difficult to prove?

Koch's postulates are:

Some individuals contain alternate versions of specific genes (alleles) that make them resistant to particular diseases. for example, people with certain globin alleles are resistant to malaria, and some people cannot be infected with HIV because, genetically, they lack the co-receptors that the virus needs to enter cells. This will lead to the failure of Koch's 3rd postulate.  

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation: