5. Red coat color (R) is codominant with white coat (R') in short horn cattle; with the heterozygous condition producing the roan (R'R) condition. A farmer has a roan bull and a red herd of cows. How can he produce a pure breeding white herd, using only his present herd? Explain your answer in detail.

In 1994, telomerase activity was discovered in human cancer cell lines. although telomerase activity is rarely present in human somatic tissue, this discovery indicated that humans do contain the genes for telomerase proteins and telomerase rna. since inappropriate activation of telomerase may contribute to cancer, why do you think the genes coding for this enzyme have been maintained in the human genome throughout evolution?