what color will pups be if i breed solid black gsd to red and black female?

In plain english. You will get a variety of colors based on each parent and grandparents genes. I wouldnt breed just for color tho. Do a thorough background on both parents and gparents for any genetic problems(such as hips). Make sure you have good solid genes health and pesonality wise in this type of breed. You can get 5 generation background from AKC for a minimal amout of dollars. Best of luck.

This is a wonderful breed. The idea is to improve on good solid quality traits.

Solid black is recessive in GSDs, but I don't know what you mean by "red and black". Is that a sable? Black-and-tan? Traditional saddle pattern?

The main colors will be found at the A locus, and you can learn more about them here: http://homepage.usask.ca/~schmutz/agouti.html

What it's going to come down to is what the female carries - if she is homogenous, than her color is dominant to black and only black could result. If she carries anything recessive, it could be expressed since the most recessive option will be passed on by the male and "masked" by whatever she contributes.

ADD: Here is more information: http://www.jmadesign.com/Frankenhaus/colorgen01.sh...

And I do agree with the other poster in hoping you have thought about things other than color? This is a breed where 20% of dogs have elbow dysplasia, 4% have hip dysplasia, and almost 30% have thyroid malfuntion, all of which are genetic in nature and should be tested in breeding dogs. Then there are unstable temperaments... please do your homework before you bring another litter of a popular and often poorly-bred breed into the world.

Black

Informative answer:

If you have not graduated any biology class, do not know what a Punnett square is and don't have a clue what recessive and dominant traits are, as well as other issues dealing with breeding/genetics and pedigree then MAYBE you should not be breeding.

NO way to know since they will be ill bred mongrels.

Spay and neuter your dogs

Whatever genetics are in either line.