The answer is <span>B: There are 2 alleles for freckles.
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Answer:
This in effect increased the world's carrying capacity and allowed population to grow exponentially. Since 1963, however, the ratio between energy increases and population growth has narrowed. This change could restrict future population growth.
Carbon fixation only takes place in autotrophs. For example plants, algae, and some bacteria, or organisms that make their own food.
Answer:
Makali may produce only small amounts of a non-mutated (wild-type) GALT enzyme.
Makali may have normal amounts of GALT, but the enzyme may be mutated.
Explanation:
Makali is lactose intolerant because of his ancestry. Because of this he is not able to digest any lactose which indirectly protected him from galactosemia. Thus he must avoid consuming galactose. He has a low GALT or galactose 1‑phosphate uridylyltransferase activity. He has a normal amount of GALT and may produce only small amounts.
Answer:
They used radioactive labeling techniques to build two different types of phage.
Explanation:
In 1952, a set of experiments were carried out by American biochemists Alfred D. Hershey (1908-1997) and Martha Chase. They prepared two separate virus samples, one contained DNA labeled with a radioactive isotope and the other contained protein labeled with a different radioactive isotope. They grew the two types of viruses separately, infected bacteria with the two sets of phages and analyzed the bacteria for radioactivity. From the results obtained, Hershey and Chase concluded that the viral genetic material was DNA and not protein, reinforcing the observations previously made by Avery.
