Homologous chromosomes differ from sister chromatids because A: sister chromatids cannot be separated from one another, while homologous chromosomes can.

B: homologous chromosomes are formed after replication, while sister chromatids exist prior to S phase of interphase.

C: homologous chromosomes are identical copies, while sister chromatids are only similar in gene location.

D: sister chromatids are identical copies, while homologous chromosomes may differ in the allele present.

the answer would be 3

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.