In guinea pigs, Brown fur is dominant to white fur and short fur is dominant to white fur. In a dihybrid cross of two heterozygous individuals, how many genotypes are there and how many phenotypes are there? What are they? Draw a Punnett Square for this cross.


Pretty pwease? I'll give you rep and e-cash or whatever..

Sorry, dude... My Biology teacher was shite. I can't remember a single thing from the course.

Anytime you have a basic dihybrid cross like this (two heterozygous individuals crossed with no sex-linked traits, incomplete or codominance, etc.), you will get the same ratio of 9:3:3:1. For your problem, there would be 9 with brown and short fur, 3 with brown and long fur, 3 with white and short fur, and 1 with white and long fur. <--Four phenotypes.
The way you present your genotypes depends on what you choose to represent the guinea pigs' traits. For example, B could be brown fur, and b could be white fur; S could be short fur, and s could be long fur. Then, the resulting genotypes would be: BBSS, BBSs, BbSS, BbSs, BBss, Bbss, bbSs, bbSs, and bbss. <--Nine genotypes I think

Thanks man, I had the first paragraph down and got some of the second paragraph but I didn't know that there were 9 genotypes, and I did do the same thing with the genotype representation.

It says I gotta spread rep around so i'll hit you back sometime but I did send over cash.

Preciate it dawg, always glad to try and help :)