Suppose that a carrier of familial down syndrome mated with a person with a normal karyotype. which gamete from the carrier parent could fuse with a gamete from the normal parent to produce a trisomy-21 zygote?

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Iguess i would say diagrams would be most difficult subject too correct

True but only in the south coastal areas during september and early october.