How is sex determined in these salamanders? Genetics homework help needed!
Posted 1 March 2010 - 03:32 AM
Posted 7 March 2010 - 07:24 PM
Now salamanders can reverse sex, and this can be induced by hormones, particularly steroids - no doubt there will be environmental triggers for this.
if we have a sex-reversed (ZW) male and a normal (ZW) female, then we have the following combinations for the offspring (just do the punnet square)
ZZ, ZW, ZW and WW.
I would expect that much like you cannot have a y-y offspring in humans (but you can have XX, XY) because essential genes are missing on the y chromosome, the situation is the same with the ZW combination - WW is simply not viable, so the only offspring that are born are the ZZ (male) ZW and ZW (both female), explaining the 2/3 - 1/3 ratio.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users