Check my Homework Answers?

1- Which of the following is a source of new alleles within a population?





A-mutation


B-meiosis


C-genetic drift


D-genetic recombination


I think it is D?





2- New alleles arise by:





A-random mating.


B-genetic drift.


C-independent assortment.


D-migration.


E-mutation.


I think it is E. but I could be wrong. I am confused between question 1 and 2.





3-Four of the five answers listed below are portions of the theory of natural selection. Select the exception:





A-Natural selection is the result of differential reproduction.


B-More organisms are produced than can survive.


C-Variation is heritable.


D-The largest and strongest always contribute more genes to the next generation.


E-Heritable traits vary in adaptability.


Is D the right answer?

Check my Homework Answers?
1 A. The only one of these that actually produces a new allele (a new form of the gene for the trait) is mutation. The other choices just mix up the alleles that are in the gametes. A mutation is like putting a 15 of spades in a deck of cards. That's a new card that wasn't there before. The other choices are like shuffling the cards before dealing. Just mixing them up.





Now if one of the choices had been gene flow, that would be a possibility, but as the question is written the only choice is mutation.





2 E. New alleles can arise by mutation. The other choices are ways of recombination or bringing in pre-existing alleles (as in migration). To say that new alleles "arise" means that those alleles have just been formed. Mutation.





3 D. I agree that D is the answer. The individuals that survive aren't always the largest and strongest. Sometimes they are the ones that blend in the best or the ones that have the worst smell or the ones with the biggest thorns.





I have to go back to your original question to read the next few questions, so I'll edit in a moment.








------- Edit ------


4. Fungi - mold and yeast


Bacteria - E. coli


Animalia - sponge


Plantae - moss and fern


Protista - Euglena and Paramecium





There aren't any Archaea in the list to match.
Reply:OK, you seem to be correct for 1 and 2 (I also think 1 is confusing--it could be either A or D); D is the correct answer for 3.





Sponges are animals; archaea are single-celled primitive microorganisms, similar to but distinct from bacteria.