How do the promoter and operator work together to control gene expression?

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm