Question

NEED HELP WITH LIVING ENVIRONMENTS QUESTIONS!!! MEDAL WILL BE AWARDED....

Answer 1

Please post your thoughts for each one of those questions too. I'll correct wherever necessary. [we can not simply hand over you the answer :) ]

Answer 2

@Abhisar

1) I am confused with this question between choices 1 and 3. I have a feeling that it can be 1 because fossil discoveries do show that species are evolving throughout time but the fact that it said which one shows that it is still taking place makes me think that it's mutations because mutations currently happen in the DNA sequence of organisms, such as flies as mentioned in the question.
2) Option 4 -- The modern theory of evolution tells that organisms are changing in their genotypes, which will have an impact on their phenotypes as well. But this option contradicts that statement.
3) Option 4 -- Natural selection would happen when the environment favors certain variations on organisms and those are the ones that will survive and reproduce and the others that don't have these favorable traits, they will become extinct.
4) Option 2 -- In meiosis, the chromosomes of both parents undergo combination phase leading to variations within offsprings and those variations may help certain organisms to survive.
5) Option 1 -- A genetic mutation can only be positive if it benefits the organisms and helps it to survive the changing environment.
6) Option 3 -- Evolution is basically the change in organisms over time, so if there's more mutations then there are more alterations present in the genotypes and phenotypes.
7) Option 3 -- The organism that will be able to survive through various limitations in the environment through their favorable traits will demonstrate survival of the fittest.
8) Option 2 -- This short passage was talking about how some bacterias are now resistant to some antibiotics.
9) Option 4 -- There will not be competition between the resistant and the nonresistant bacterias and so the resistant bacterias will be increasing in number.
10) Option 3 -- Plasmids, circular pieces of the DNA, can be transferred to the nonresistant bacterias (which is the concept of genetic engineering?)
11) Ability to grow resistance to the antibiotic
12) Option 4 -- The selecting agent is the flypaper because that will help to determine which trait is favorable for the "environment" present in the experimental jar.
13) Option 1 -- The winged flies are the ones that are more prone to being stuck in the flypaper so the wingless flies will not fly and get themselves attached to the flypaper.