answer: You inherit a copy from one parent, and the other copy from the other parent.
B- evolution. Decent with modification was an early theory (of evolution) that was set out before people had any idea about genetics and how traits were transferred
Here are the answer for each item.
1. With each cell division, chromosomes gradually shorten in the absence of telomerase activity (FALSE)2. During embryonic and childhood development in humans, telomerase activity is relatively low compared to the level of activity in most somatic cells of an adult. (FALSE)
3. <span>Cells that divide frequently tend to have relatively low levels of telomerase.(FALSE).
</span><span>4. The activity of telomerase in most mature somatic cells is kept high by increasing the expression of the gene encoding this enzyme. (FALSE)
5. Mice with low telomerase activity appear to be normal for up to six generations, but they show steadily decreasing telomere length that eventually leads to nonviable offspring. (FALSE)
6. When telomerase is added to cells grown in culture, their lifespan decreases relative to controls that have no telomerase added. (FALSE)
7. Cancer cells generally have high levels of telomerase activity, which allows them to divide indefinitely without the chromosomes getting shorter and shorter. (TRUE).</span>
Keyword on this question would be external so while A is biologically correct, it happens internally so it's wrong. Inflammation and swelling occurs below skin surface so internal as well. C is an external response while D is also internal. So your answer would be C
Answer:
A mutation in <u>DNA </u>results in a change in <u>RNA </u>that sometimes produces a <u>protein </u>with altered structure and function.
Explanation:
DNA is the hereditary material which causes gene expression in our body by producing protein. The type of protein which is produced by DNA totally depends upon the sequence of nucleotides in the DNA. But, DNA molecule does not produce protein directly. Initially it produces RNA (mRNA, tRNA, rRNA) by the process of transcription, the nucleotides in the RNA are complimentary to those in DNA. In short, the message regarding the structure and composition of the type protein to be produced by DNA is first decoded from DNA in the form of RNA. These RNA molecules then synthesize the protein as per the instructions from DNA by the process of translation.
But, in case a mutation occurs in the DNA which causes a change in it's nucleotide/nucleotides, the protein which will be produced will be different in the structure and function than the protein which was supposed to be synthesized. It happens because, a triplet of nucletiodes in the DNA and hence RNA specifies a particular type of amino acid and several amino acids are joined in a long chain to form polypeptide which ultimately forms protein. But, if any nucleotide in the triplet is changed due to mutation it may change the amino acid and if amino acid will change the protein will also get altered.