Genetics question

[Jbarnes668]

I kind of have this punnet square thing figured out but when it geta to co-dom traits it confuses me. I know that breeding a mack snow x tremper will produce 50% mack snow het tremper and 50% normal het tremper. But if I bred a mack snow het tremper to a tremper would I get 50% tremper and 50% mack snow tremper?

 

[acpart]

50% of them will be Trempers and 50% will be het Tremper
50% of them will Mack snows and 50% won't

Some of them will be Mack snow trempers but my statistics is too far in the past for me to tell you what percentage.

Aliza

 

[Jbarnes668]

But since I'm breeding het tremper to tremper wouldnt the recessive trait for albino be shown as dominant so I would get 100% tremeper 50% of those being mack snow because mack snow is codom?? Not saying you are wrong just trying to understand

 

[DrCarrotTail]

Tremper is recessive and Mack snow is co-dominant. So if you work the two punnet squares seperately you get

Tt (het tremper) x tt (tremper albino) = 50% Tt and 50% tt (tremper is written as lower case because it is recessive)

Ss (Mack snow) x ss (non-snow) = 50% Ss and 50% ss (Snow is written as capital S because it is dominant

Now if you combine them you'll get:

25% TtSs (Mack Snow het Tremper)
25% Ttss (non-snow het tremper)
25% ttSs (Mack Snow Tremper albino)
25% ttss (non-snow Tremper albino)

Does that make more sense?

 

[DrCarrotTail]

In order to see the codominant nature of the Mack Snow gene you need to breed two snows so the possibility of getting a super snow exists. Co-dominant genes behave exactly the same way that dominant genes do except when two copies of them are present (i.e. Super snow).

 

[Jbarnes668]

Okay yeah that makes a little more sense, thanks for the replies, helped out a lot!