There are two mice that are brown in color. Brown is a dominant allele in mice. In order to determine whether the mice are homozygous dominant or heterozygous, which of the following mice could you cross with them?

The answer is a. i hope this

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11