Edexcel GCSE biology paper 1 Unofficial mark scheme

Scroll to see replies

Did u write about the parents being heterozygous dominant and the 25 percent chance because o is recessive and requires two recessives to be expressed

Original post by cats786

I filled in the punnet square and wrote how o is recessive and ab was dominant and there is 25%chance it was o

6.2

Probs??

Original post by Inzz3

I swear it was carbon dioxide and chlorophyll

Reply 23

MrBananaMonkey

Original post by 06Dhoworth

What did people get for the rate question?

I got like 0.008s-1

yh I got the same as you

Reply 24

cats786

Yeah

Original post by Inzz3

Did u write about the parents being heterozygous dominant and the 25 percent chance because o is recessive and requires two recessives to be expressed

Reply 25

maryam.010

nah i checked after the exam, it's oxygen :/

Original post by cats786

Probs??

Lens x??

wasn't the direction of the impulse on the sensory neurone question going the wrong way. It was going towards the receptor cells and not towards the dendrites??

(edited 4 years ago)

Reply 28

Jack.s2468

Original post by Inzz3

Did u write about the parents being heterozygous dominant and the 25 percent chance because o is recessive and requires two recessives to be expressed

did u do edexcel or aqa cause that wasn't on my paper?

Reply 29

311202st

I think completing the punnet square itself gave you the half the marks. Saying it was 25% chance and saying how both parents are a carrier of the recessive O allele gave you the other half of the marks

Original post by Inzz3

Did u write about the parents being heterozygous dominant and the 25 percent chance because o is recessive and requires two recessives to be expressed

Reply 30

311202st

it was oxygen and chlorophyll

Original post by cats786

Probs??

Reply 31

Woodsyy

Original post by 06Dhoworth

What did people get for the rate question?

I got like 0.008s-1

Yes!

Reply 32

mono5304

Carbon dioxide enters through the stomata, so it was oxygen and chlorophyll! Sorry!

Original post by Inzz3

I swear it was carbon dioxide and chlorophyll

Reply 33

username4083746

what on earth was that myelinated sensory neurones vs unmyelinated neurons in the brain question?

Reply 34

bhx6

everything i got:
food test for reducing sugar- benedicts solution on food then into water bath
297 for the mean one
cones are the part that detect coloured light
lens y because i thought the defect was short sightedness since light focused in front of retina
oxygen and sunlight absorbed by chlorophyll
eukarya- multiple choice about plants
blood group 6 marker- a and b are codominant so need recessive allleles to get o blood so 25%
synapse- gap where neurones meet, transfer neurotransmitter that cause electric signal in next neurone
gonarrhea- bodily fluids, wear protection, talk about how its significantly increased these past few years
1.84 x 10^8 i think it was
0.0008 one for the rate
for the amount of people infected i got 895000
rna polymerase multiple choice one

Reply 35

stresssss

The axon was the line going through the middle x

Reply 36

cats786

I wrote myelinated was quicker

Original post by sunnycloudyskies

what on earth was that myelinated sensory neurones vs unmyelinated neurons in the brain question?

Reply 37

mono5304

Original post by sunnycloudyskies

what on earth was that myelinated sensory neurones vs unmyelinated neurons in the brain question?

It was referring to the myelin sheath on some neurones. They only allow impulses to travel in one direction but they travel faster. In the brain, they don't need to travel that fast since everything's closely connected, but from one body part to another requires the myelin sheath to speed up impulses.

Reply 38

bhx6

i got y because the light focused infront of the retina so it was short sightedness

Original post by cats786

Lens x??

Reply 39

yaashaa1

Original post by 311202st

wasn't the direction of the impulse on the sensory neurone question going the wrong way. It was going towards the receptor cells and not towards the dendrites??