21. what enables a gene to code for different versions of a trait in different organisms? a. differences in the sequence of alleles on a chromosome b. differences in the sequence of genes on a chromosome c. differences in the sequence of amino acids in dna d. differences in the sequence of nucleotide bases in dna,

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

What must be done to breed dogs for a partical trait

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.