A new mutation that arose in one copy of gene Xin a somatic cell resulted in the formation of atumor. Which of the following pieces of evidencebest describes how the new mutation directlycaused the tumor?(A) Protein X normally stimulates cell division,(B) Protein X normally activates a growth(C) Protein X normally prevents passage through(D) Protein X normally regulates geneand the mutation created an overactive

Explanation:

Protein who stimulates cell division are known as proto-oncogenes. If there is a mutation in proto-oncogene ,then this gene is converted into oncogene which causes cancer. Here protein x ( proto-oncogenes) normally stimulates cell division, if new mutation occurs in this gene, then this gene is converted into oncogene and resulted in the formation of cancer.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?