ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: qshyrn on October 25, 2009, 12:50:29 pm

Title: should you discount Y-linked inheritance?
Post by: qshyrn on October 25, 2009, 12:50:29 pm

i read somewhere that Y chromosome doesnt contain any genes which really determine the phenotype (apart from male sex).. so when asked a question about a pedigree, should you only explain why it can/ cant be X-linked AND NOT anything about Y-linkage??? or should u mention and explain that it cant be Y-linkage?

Title: Re: should you discount Y-linked inheritance?
Post by: shinny on October 25, 2009, 12:53:28 pm

There's not many, but there are some Y-linked conditions, meaning you'll have to explain it.

Title: Re: should you discount Y-linked inheritance?
Post by: qshyrn on October 25, 2009, 12:54:09 pm

Quote from: shinny on October 25, 2009, 12:53:28 pm

There's not many, but there are some Y-linked conditions, meaning you'll have to explain it.

ok thx shinny

Title: Re: should you discount Y-linked inheritance?
Post by: Edmund on October 25, 2009, 12:54:18 pm

If all males shown in a pedigree is affected and all males pass on the the trait to all of their offspring, then this would be Y-linked.

Title: Re: should you discount Y-linked inheritance?
Post by: qshyrn on October 25, 2009, 12:56:21 pm

i shoulda done more research before asking this question :idiot2:..  there are y linked disorders like male infertility.
o well hope this reminds people not to discount the y-linkage
EDIT: this wasnt a good example another example is hairy ears! (eww)

Title: Re: should you discount Y-linked inheritance?
Post by: kenhung123 on October 25, 2009, 01:17:44 pm

I think all you need to know is y linked=from father to sons only

Title: Re: should you discount Y-linked inheritance?
Post by: qshyrn on October 25, 2009, 02:04:16 pm

Quote from: andrewloppol on October 25, 2009, 01:59:10 pm

Quote from: qshyrn on October 25, 2009, 12:56:21 pm

i shoulda done more research before asking this question :idiot2:..  there are y linked disorders like male infertility.
o well hope this reminds people not to discount the y-linkage

How can a Y-Linked condition be infertility lol?
The guy can't have a kid with the condition though :P?

i read it off wiki and i think it may mean something like low sperm count(just guessing), but he could have a kid through reproductive technologies..
another  example is hairy ears lol :o

Title: Re: should you discount Y-linked inheritance?
Post by: mmmmm on October 25, 2009, 08:56:30 pm

but is y-linkage usually in the exams? :S

Title: Re: should you discount Y-linked inheritance?
Post by: shea43 on October 26, 2009, 09:09:12 pm

Quote from: andrewloppol on October 25, 2009, 09:15:16 pm

Quote from: mmmmm on October 25, 2009, 08:56:30 pm

but is y-linkage usually in the exams? :S

Y-Linked is really easy though, just think:

He has to give his Y to ALL his sons. (So basically we're talking every male being affected).
And all their sons.

Havn't seen it before in an exam though.

Yeah I haven't seen it either. But your right, and they'd have to give you at least 3 generations of pedigree to make sure, so it wouldn't be that hard to pick