Most cells in the human body contain two sex chromosomes. Which type of cell does not have two sex chromosomes?

Liver cell
Muscle cell
Nerve cell
Red blood cell​

liver cell

Explanation:

The liver parenchyma is primarily comprised of hepatocytes. Hepatocytes are polygonal epithelial cells with abundant eosinophilic, granular cytoplasm and large, centrally located round nuclei. Hepatocyte nuclei often contain a prominent nucleolus. Binucleated hepatocytes (= containing two nuclei) are not uncommon.

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.

b is dominant over the allele for the white fur.