Expert: Chris Larsen - 8/29/2008

Question
there are these punnett square graphs on the paper i need to send in. I've looked all over in my textbook and it is just not clear how to put these graphs together...the questions are:
1. consider two plants with the genotypes Rrtt and rrTt where red color (R) is dominant over white (r) and being tall (T) is dominant over being short (t).
A. complete the following punnett squares to determine the possible gametes each parent could produce. (there are two graphs one with 4 boxes each and R t on the top and t t on the side and the second graph with 4 boxes and r r on the top and T t on the side)
1.B. using the punnett square below, diagram a cross between these plants. keep in mind this is a dihybrid cross. (its a blank graph with 16 boxes)
1.C. list the possible genotypes (genetic makeup) and phenotypes (physical appearance) from this cross.

thanks!

Answer
Hi Brittany,

Since this sounds like a homework question, I won't provide you with the answer but this link may prove to be very useful in helping you complete this assignment:

http://en.wikipedia.org/wiki/Punnett_square

I'll provide you with an example of a punnett square here:

    X       Y
___________________
X |  XX     XY    |
Y |  XY     YY    |
___________________


I hope this helps, and thanks for the question!

Regards,

Chris