ACCORDING TO MENDEL LAW OF DOMINANCE, PURPLE COLOR IS A DOMIMANT TRAIT WHILE WHITE COLOR IS A RECESSIVE ONE...
The lac genes encoding enzymes are lacZ, lacY, and lacA. The fourth lac gene is lacI, encoding the lactose repressor—"I" stands for inducibility. One may distinguish between structural genes encoding enzymes, and regulatory genes encoding proteins that affect gene expression.
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Karyotyping is used to:
study chromosomes.
treat Down syndrome.
repair chromosomes.
diagnose genetic diseases.