It is true that telomerase activity declines with old age which explains why cells lose their ability to divide after many replications.
Telomeres are DNA–protein complexes found at the ends of each chromosome they contain repetitive sequences of DNA. Telomeres protect the genome from nucleic bases degradation, unnecessary recombination, repair, and prevent the fusion of chromosomes. Telomeres, therefore, play a vital role in preserving the information in our genome.
Telomeres shorten with every consecutive DNA replication cycle limiting the number of cell divisions a cell can undergo, Telomeres act as a tumor suppressor by halting the replication of cells which contains several mutations after many division cycles.
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2. Cell (Plasma) membrane
4. A cell membrane is made of phospholipids, is flexible, and is found in animal cells. A cell wall is made of cellulose, is rigid, and is found in plant cells.
Answer: Crossing over is a biological occurrence that happens during meiosis when the paired homologs, or chromosomes of the same type, are lined up.
Explanation:
C the appearance of new phenotypes in the offspring
