Since the Apollo missions, have American astronauls been continuously in space?

Yes they are actually planning to launch a Rover to Mars soon in around 2030s

Explanation:

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )