kingpomba's question thread

[slothpomba]

Yeah good point but that doesn't 100% prove it isnt autosomal either at the same time

[thushan]

You can only disprove X-linked recessive here, as there exists a son of an affected mother who is not affected.

You cannot definitively prove that it is any of the other three modes of inheritance. The question should read "what is the LIKELY mode of inheritance" in which case it should be X-linked dominant. If a pedigree is consistent with X-linkage, although autosomal is possible, it is likely X-linked as the probability of a pedigree being consistent with X-linkage by chance for an autosomal trait is quite low, especially when there are many children involved.

[Russ]

Yeah i know it'd have the same result but i thought there was maybe some convention we have to follow.....

Convention is dominant first. Whatever you do, don't use a different order for multiple boxes in the same punnet square

[slothpomba]

Wow i thought VCAA would be less ambigious and cofusing than the other exams from external companies... but its the opposite -_-

Theres a downer

[slothpomba]

Anyone want to explain the 3" to 5" or the 5" to 3" its one of the main points im still alittle unclear on...

[slothpomba]

Anyoneeeee

[TrueLight]

its just the structure of the dna molecule

3' end is the third carbon which attached to that is the hydroxyl group

the 5' end is the 5th carbon on the sugar that has the phosphate group attached

therefore when you have transcription or replication you synthesize new nucleotides on the 3' end of the dna molecule

[slothpomba]

Cheers! Thanks a lot mate karma for you

[masonnnn]

yeah like said always try to disprove it's x-linked.
you can't prove autosomal but you can disprove x-linked which indicates it is likely to be autosomal.