AQA Biology AS Level Unit 2 thread

hardly plants last year, oh noooo this year they prob bombard us with plants T_T

I AM CLOSE TO KILLINGFG MYSEL

ok lmao maybe not but why is the rabbit a vector like help how do u know species A and C will produce the same antibodies omgg I am sliding down the slide to madness thx AQA

nooooo-oooo-ooo 😱😭

ok look at it this way, lets say you have three species, A B and C and you wanna know if A is more closely related to B or C now what you do it this:

1. Take protein from A and add it to a rabbit
2. Obtain the antibodies from the rabbit
3. add these antibodies to the proteins of B and C

now, the protein and antibody will form a ppt, lets say more of the ppt forms with the antibodies with B than it does with C this means that A is more closely related to B than C

hope this helps..

it does, tnku! :3 see my edit, thou..

so, to clarify, it's basically determining how similar the "proteins" (whatever the antibody - which is specific - binds to) are in the species, which is observed by the mass of the precipitate formed? I think!

exactly that, except in the paper say how closely related, not how similar the proteins

Any chance someone could list all the differences between meiosis and mitosis?(6mark style)

the only ethical aspect of unit 2 is probably the maintenance of biodiversity and why its important to conserve habitats and species for both economic and ecological and environmental reasons.

Aren't there ethical issues in the stem cell research as well? The In vitro fertilization as a medical practice and the obtaining of ES cells from embryos

where in the spec is this

Mitosis produces two diploid daughter cells, whereas meiosis produces four haploid cells. With mitosis one cell division occurs whereas with meiosis two cell divisions occur. Mitosis occurs in asexually reproducing organisms, whereas meiosis occurs in sexually reproducing organisms. Mitosis produces normal body cells to replace them quickly. Meiosis produces sex cells only(egg and sperm cells). With mitosis crossing over cannot occur where as it can in meiosis.

That's all i've got

Aren't there ethical issues in the stem cell research as well? The In vitro fertilization as a medical practice and the obtaining of ES cells from embryos

and that the daughter cells are genetically identical in mitosis, but in meiosis every daughter cell is genetically different due to independent segregation of chromosomes and crossing over

the taxonomy/classification:
kingdom
phylum
class
order
family
genus
species
(remember this: King, Phillip, Came, Over, From, Germany, Swimming.)

also you need to know the binomial naming system= genus and species.

what the term hierarchy means.

how a phylogenic system differs to a simple hierarchy

teh principles in which biologists use to classify organisms into groups

cant think of anything else
hope this helped

can you explain the difference between phylogenic system and heirarchy pls?

can you explain the difference between phylogenic system and heirarchy pls?