12. in our somatic (body) cells, we have chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is chromosomes

12. In our somatic (body) cells, we have 2N chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is N chromosomes

Explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.