The distribuition of alleles changes due to random chance.
Rickettisias are now considered as bacteria because they have the characteristics of been spread by arthropods vectors, the cells are extremely small and can be rod shaped or coccoid and they have typical bacterial cell walls. They have no flagella, they are gram negative and multiply by mean of binary fission only in their hosts cells.
Because as of right now the over use of antibiotics will lead to the bacteria developing a resistance and eventually an immunity which is bad for obvious reasons
This phase is metaphase, and you can remember this by seeing the m means middle.
The chromosomal combination allows for each sex cell that is going to be produced to have different DNA combinations, allowing for the offspring to be not only different from the parents, but also allows for genetic diversity.
Answer:
The protein you eat helps repair tissue and fight off viral or bacterial infection. Proteins make up the framework of your cells, including the cells of the immune system and just about every other.