BioFags how is this even possible?

>>9011289
Seems like a pretty straightforward case of an autosomal recessive trait. Parents 1 & 2 were Xx carriers, Children 2 & 5 were xx by bad luck, and they mated with Xx carriers, giving their children a 50% chance of inheriting a disorder but a 100% to be either a carrier or affected.

>>9011291
thanks for the reply, but how can you have an unaffected female (4) and an affected female (5) if the parents are both just carriers?

>>9011294
Yy x Yy can produce yy (1/4 affected)
Yy x Yy can also produce YY or Yy (1/4 unaffected, 1/2 carrier)

>>9011302
Are you referring to butterflies?

From doing out a cross where the parents are (X^N X^n) and (X^? Y^n) .
The Male X would have to be dominant or recessive to get an affected and non affected female so which is it? if its dominant we would get the unaffected female but then how is the affected female explained?

>>9011308
Who said it's sex linked?

Brachydactyly is not sex lined by the way.

>>9011294
Both parents are heterozygous carriers, and yet they are not affected by the disorder. This means that the disorder is recessive, since having one allele doesn't lead to the disorder. Xx (x) Xx will lead to either XX (unaffected; 25%), Xx (carrier unaffected, 50%), or xx (affected, 25%).

>>9011341
Obviously, #4 is XX, and #2, 3, & 5 are affected. There could have been a carrier, and though I haven't done the math, I think it's odd that there isn't, but this is theoretically possible.

>>9011324
Well i just thought that Y had to be recessive or else there wouldn't be affected males as offspring

OP here, I think I got it now, I was crossing them as if the sex mattered but I see its just a straight forward cross as >>9011341
just mentioned.
thanks guyz

>>9011308
It's autosomal; not carried on the sex chromosomes

>>9011373
I got it. I didn't realise it was a straight forward basic cross. Thanks for the help