Biology Forums - Study Force

Please I need an answer to the question below
 
Draw tetrahybrid crossing using punnet square and derive photypic ratio and genetypic ratio.

Are you serious?

I mean, I can do it but the worst case I give to my university students is a dihybrid cross.

Either you teacher is an a**ehole or more likely your teacher is an a**hole.

Please reply if you actually want the tetrahybrid cross and I will provide it.

Post Merge: 7 years ago

Ok, I couldn't resist the challenge....

Here is the Punnett square:



tinypic.com/r/2dmgqjl/9

Since the phenotypic frequency for a single trait cross is 3:1 (dominant:recessive), when considering a tetrahybrid cross the phenotypic frequency is (3:1)^4
= 81:27:27:27:27:9:9:9:9:9:9:3:3:3:3:1

Since the genotypic frequency for a single trait cross is 1:2:1 (AA:aa:aa), when considering a tetrahybrid cross the genotypic ratio is (1:2:1)^4
= 16:8:8:8:8:8:8:8:8:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:4:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:2:1:1:1:1:1:1:1:1:1:1:1:1:1:1:1:1
that's 1x 16, 8x 8, 24x 4, 32x 2, 16x 1