I was just doing this paper too.im so stupid I forgot the word "interphase" I just put "the cells are in the S phase where DNA replicates" .got 0 -.- Have you done 6b) that question does not make sense at all
I was just doing this paper too.im so stupid I forgot the word "interphase" I just put "the cells are in the S phase where DNA replicates" .got 0 -.- Have you done 6b) that question does not make sense at all
So when they are " / / " they still count as homologous chromosomes/ a homologous pair? And when they are / / do they count as two chromosomes as one of the chromosomes will have originally come from a sperm cell and one of the chromosomes will have come from an egg cell? Also, when they are X X is each chromosome (X) made up of sister chromatids, and one pair of the sister chromatids is from the father and one pair of the sister chromatids from the mother.
Sorry if that it a very confused set of questions but I am very confused by the wording of everything when I try and link it to / and X etc!
Anyone able to help me with the above questions? My questions are in response to havana-affairs post but I don't know how to quote is post as well as mine. Just had a look at the Nelson Thornes book and it says this "In the first division the homologous chromosomes pair up". Does that just mean they align next to each other? It then says "the homologous pairs have separated" does that just mean that the two chromosomes that are homologous chromosomes just split into different cells?
what are the advantages of selective breeding and what definition would u use in the exam?
Advantages:-
Improves the species resistance to disease, meaning if more of specie is resistant to disease in for example cows, less number of cows die so increased yield of meat/milk
Which leads on to second advantage
Increased yield means cheaper prices for the meat/milk
3rd advantage) interbreed a certain characteristic meaning the specie causes less damage to each other
4th) food can be produced more efficiently of a consistently high quality which also means reduced prices
Thats actually a formula I think, which aqa expected us to kind of work out somehow. Its always 2^ power of how many different chromatids you have I think
In fact in maths wise. We use this to determine how many different combinations can be formed for example. How many different combinations. Search this online for it to be explained
I was just doing this paper too.im so stupid I forgot the word "interphase" I just put "the cells are in the S phase where DNA replicates" .got 0 -.- Have you done 6b) that question does not make sense at all
Oooops misread it, although I still don't get it after I've misread it, why when transpiration is not occurring at night is there greater water movement in the trunk than in the branches?
I'm confused, I always thought that a higher water potential meant it was closer to pure water = 0 so anything lower meant it had proteins/solutes in them so are more negative.
Which exam paper is that?
Yes me too, that was what I was confused about. Well this question wasn't on any of the papers from the new spec so I'm guessing the old spec then.