Di hybrid Cross help

[Guest kenshi64]

Hello guys, my noodles getting twisted trying to figure out what the guide is saying and what the text says and now I can't remember how to perform a di-hybrid cross.

So first you go about getting the gametes. I remember this vaguely. But : 1) Whose gametes are these? Each parent right? 2) Do we get the gametes with both traits at the same time? if so, how?

3) Can someone help me with these chapters!! Gen 1 and 2!! Thanks! :panic attack:

[Jaymi]

Heyy!! okay so you're confused on the Genetics topic? No problem! I always find this site helpful with IB biology. Has everything you need to know.

If you're still confused..post again to say so and i can help=)

[ILM]

Dihybrid cross are the crosses in which you deal with two traits not one, For example the shape (wrinkled is recessive (w) and roung is dominant(W)) and color of a bean (yellow is recessive ( Y ) and green is dominant ( Y )).

You start by looking at the genotype of parents for the both traits for example:

PAERENT 1: Homozygous recessive then it is wwyy.

Parent 2: Heterozygous then it is WwYy.

Gametes: According to independant assortment each allel can go with any other allel from the second trait:

PARENT 1 will produce only (wy)

PARENT 2 will produce (WY, wY, Wy,wy)

Now that time to do the punnet square

WY wY Wy wy

wy WwYy wwYy Wwyy wwyy

this is the whole process

don't hesitate to ask other question

Edited August 28, 2011 by King inm Glau