It's over!

[LFTM]

You know the question asking OUTLINE how someone can predict if the organism was heterozygous for 2 gene loci. Did you need to show the cross? I was like why are they leaving a big space here for just "test cross answer"?

I guess if you said its hetero if it was...........1 1 1 1 and if you said that you can say yes. If its not 1 1 1 1 then its linked i guess

You needed to say test cross and then show the cross.
Whenever they leave that kind of space, they always intend you should show the cross.
Again, it was ambiguous.

Yea i showed the cross anyway. I said it should show 1:1:1:1 phenotypic ratio if on same chromosome not in that ratio. Is that sufficient?

thats the case if it was hetero
but i thought you might of had to mention that you couldnt tell if they were on the same chromosome if the unkown plant was homo at both genes because then all offspring would show dominant phenotype regardless of them being on same or diff. chromosomes
dunno if thats right tho...i ended writing a lot for that 2 line qs

You had to say that yes it is possible. Cos in a test cross if the PHENOTYPIC ratio is 1:1:1:1 then they are unlinked, or on different chromosomes. A different ratio would mean that they are linked, or on the same chromosome.

I put a phenotypic ratio of 1:1:1:1 indicates the genes are on diff chromosomes.

[kenhung123]

in that mc question about the pigs they wanted us to pick the cross between the asian pig being female and the british pig being male

yea cos the asian pig is the one that produces more offspring.

I don't know what thats asking. Anyone explain? So its D?

[kenhung123]

i reckon the examiners would have to mark us leniently

Well its all relative. 60/75 top 1% of state or 70/75 top 1% of state same thing. But nonetheless they will be more lenient its like further and specialist maths. Further you get bashed for wrong decimals maybe specialist doesn't worry too much about that.

[fdsfsgdfgdf]

for the last question doesnt the red dyre refer to the person being tested and the green dyre represents a normal allele? dam i need to see that question again!!

[LFTM]

in that mc question about the pigs they wanted us to pick the cross between the asian pig being female and the british pig being male

yea cos the asian pig is the one that produces more offspring.

I don't know what thats asking. Anyone explain? So its D?

Im preety sure its D.
Option C mentioned breeding the british female pig with the chinese male, but it's the female chinese pig that produces more offspring than the british female.

[forsaken231]

It was D, people decided earlier

[LFTM]

So why was the pea question continuous?
I put discontinuos cos one of the graphs had 3 diff heights.

[kenhung123]

In the heights there was a range 21-25cm etc

[simpak]

So why was the pea question continuous?
I put discontinuos cos one of the graphs had 3 diff heights.

No, it didn't.
If you read the x axis, each bar was simply saying that a tree was between two heights, not an exact height.
Therefore, there were no distinct phenotypic groups.
Therefore it is continuous.

[jake]

i said continuos for the pea q coz it was more or less a bell curv and it was measuring a continuos variable being height

[forsaken231]

think about it in terms of probability, a continuous variable can be anything, like from 0 to 1 continuously it would include everything like 0.01, 0.02 etc, whereas if it were discontinuous or discrete it would be 0, 1, 2

since it has an infinite number of various heights, it is continuous, because it doesn't just jump to set values of height.
I suck at explaining

[LFTM]

So why was the pea question continuous?
I put discontinuos cos one of the graphs had 3 diff heights.

No, it didn't.
If you read the x axis, each bar was simply saying that a tree was between two heights, not an exact height.
Therefore, there were no distinct phenotypic groups.
Therefore it is continuous.

oh crap...

[LFTM]

Am i the only one that put discontinuos?
I feel so stupid.

[simpak]

Polygenic yes.
Plus, height is always polygenic.

N, you won't be the only one LFTM.
They put that graph in bars to confuse you.
When you usually see a bar graph, it's indicating that there are distinct phenotypes and therefore that its discontinuous.
They were just being mean

[kenhung123]

Definitely Continuous. Polygenic inheritance was the answer though wasn't it? Mode of inheritance or something?
It also stated the values were rounded etc. It was continuous.

Yea the top is meant to be polygenic and the bottom you explain why? I wrote continuous distribution of phenotypes in the bottom question.