which statement correctly compares the number of chromosomes in a body cell to that in a sex cell of humans?

a. a body cell has 21 chromosomes; a sex cell has 23

b. a body cell has 21 chromosomes; a sex cell has two

c. a body cell has 46 chromosomes; a sex cell has 23

d. a body cell has 46 chromosomes; a sex cell has two

2. a true-breeding plant with yellow seeds is bred with a true-breeding plant with green seeds. what color seeds will the second generation produce where yellow is the dominant seed color?

a. three-fourths green and one-fourth yellow

b. all green

c. all yellow

d. three-fourths yellow and one-fourth green

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?