Which statement describes the relationship between chromosomes, genes, and alleles? a. alleles transfer genes to the appropriate location within a chromosome. b. alleles are sites on a chromosome that genes bind to. c. chromosome's have mutated parts called genes. these mutations are caused by alleles. d. a chromosome's specific section is called a gene. alleles are variations of a gene.

D is the best of the options given. Alleles are different versions of a gene. A given gene is localized (located) in a specific location on a chromosome. A chromosome consists of genes. There are many different versions of genes out there. (i.e. the gene for hair color could have an allele coding for black, blond, red, brown, etc. colored hair. That allele would be where you find the gene for hair color on the chromosome.) Hope this helps! :)

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.

A. mitochondrion b. nucleus