could any1 doin a2 bio explain monohybrid inheritance to me plz Watch

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horrorboy
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#1
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i just dont get it and find it really hard

thanx in advance
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_EMMA_
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(Original post by horrorboy)
i just dont get it and find it really hard

thanx in advance
mendels law of segregation the charasteristics that disappear in the first generation reappear in a quarrter of the second one. this was discovered by monohybrid crosses.
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horrorboy
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(Original post by _EMMA_)
mendels law of segregation the charasteristics that disappear in the first generation reappear in a quarrter of the second one. this was discovered by monohybrid crosses.
thanx but i meant working out all the crossovers
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_EMMA_
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(Original post by horrorboy)
thanx but i meant working out all the crossovers
ok, well it is hard since i can't draw it but i can make it a try:

SS ss this is seeds or something, two different genotypes, the
parental generation

S s gametes that is used for the next generation, one from each

Ss genotype for the generation


SS Ss four combinations of the offspring
sS ss
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MadNatSci
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Do you know how to do a punnet square? If you draw one of those it's really easy... I'll scan one in and attach it to this post.
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horrorboy
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(Original post by MadNatSci)
Do you know how to do a punnet square? If you draw one of those it's really easy... I'll scan one in and attach it to this post.
thanx do u do a2 bio
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MadNatSci
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(Original post by horrorboy)
thanx do u do a2 bio
I did, I'm doing a degree now. It's scanning... hope it's clear!
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MadNatSci
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(Original post by MadNatSci)
I did, I'm doing a degree now. It's scanning... hope it's clear!
Rats, the file is too big! Anyone know how I can cut it down?

OK, have had a go on here but it's not very clear. The left hand column contains the gametes of a parent who is homozygous recessive - ie tt. The top row contains the gametes of the other parent who is homozygous dominant (TT). Now you just match up the letters which correspond to each box in the middle... it's easier to show when you're not playing with text!


| T | T |
___________________
t | T t | T t |
___________________
t | T t | T t |


Now you cross the offspring:

| T | t |
____________________
T | T T | T t |
____________________
t | T t | t t |

This is probably really unclear - if you have an email address I could send you the file?
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horrorboy
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cool i couldnt cope wiv degree level lol. wot im most stuck on it crossing the sex linked genes.
for example tongue rolling is controlled by the dominant gene and colourblindness is sex linked carried on the x chromosome.

a normal vision tongue roller marries a normal vision tongue roller. they have a colour blind non tongue roller son.

this person marries a non tongue rolling normal vision female(wiv no history of colourblindnessin family)

wot r the chances of the first child

1) being a male colour blind t roller
2) a male normal vision t roller

this is a practice question i got today and their is no way i cud of worked it out lol
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rednirt
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ouch. I cant remeber how you do that... all i know is that we used cats in our examples- ginger ones
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