Human skin pigmentation is controlled by multiple genes. what is necessary for the normal development of pigmentation? the genes must be arranged in sequence on the dna strand. the genes must be arranged into an operon. the genes must be regulated by a single enhancer sequence. the genes must share the same control element.

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.