<span>Additional facts:
A test cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring.
Answer:
You'd use it when you wish to see if the one that you think is a homozygous dominant is a purebred, because if you did get a recessive offspring then it proves that the animal is a heterozygous and not a purebred.</span>
Altitude decreases the temperature in the troposphere....
i am not very good at science but i still want to help so i search it up for you
(i searched it up on Bing)
The branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
hope this helps
