How do you make a trihybrid cross square with the following?

Question

(BbYyPp)x(BbYyPp)
Black fur is dominant over white fur. (Bb)
Yellow eyes are dominant over green eyes. (Yy)
Pointy ears are dominant over curvy ears. (Pp)
Thanks for the help! :)

Answer 1

(.....)BYP BYp Byp bYP bYp ByP byP byp
BYP
Byp
Byp
bYP
bYp
ByP
byP
byp

basically, depending on what your starting with. You make combinations of alleles that are possible to cross.

Though, this takes a lot of time and usually if your taking a test. You don't have that much time to fool around. But I doubt a teach would ask you to draw out a trihybrid cross. They would ask you to figure out the probability of getting that certain combination of alleles.

So it much better to make 3 smaller boxes and figure out the probabilty to get a dominant and/or recessive alleles.

for example

Aa x Aa

A a
A AA Aa
a Aa aa

Now you have a 1/2 chance to either get a "A" or "a" from your mom and 1/2 chance to get a A or a from you dad. This just shows where the math comes from.

so, to get a combination of AA, 1/2 * 1/2 = 1/4 chance of getting AA

Therefore you have a 2/4 chance of getting Aa and a 1/4 chance of getting aa.

Now to compare a cross like yours. To get a combination of bbyypp would be a 1/4 * 1/4 *1/4 = 1/64 chance of getting bbyypp.

I hope this helps

Answer 2

try the punnett square. but that'l ltake you long. believe me, it's time-consuming.