Anonymous

A test cross is done with an organism that is a dihybrid for two unlinked autosomal genes. What proportion of the progeny will be true-breeding for both genes? 0%, 25%, 50%, 75%, 100%

1

1 Answers

John McCann Profile
John McCann answered

25% of course!

Do your cross by Punnet square or branching line and see that only four true breeders for the original cross will be your outcome.

Looks something like this.

Aa X Bb

--------------The rest will be mixes of the above and not true breeders.

3 People thanked the writer.
View all 4 Comments
John McCann
John McCann commented
No, I am ethologist. This is pretty standard genetics though.
Charles Davis
Charles Davis commented
Hmm so you're closer to a paleontologist. these ...ists baffles me LOL
John McCann
John McCann commented
https://en.wikipedia.org/wiki/Ethology


This is ethology. The study of animal behavior in the wild. I was a Canid ethologist and studied Canis lupus arctos, the Arctic wolf, for much of my time in the field.

Paleontology is a subdivision of earth science. Geology, in other words.

Answer Question

Anonymous