The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because A) it revealed new and unanticipated features of Mendel's pea plant varieties. B) it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. C) it allowed scientists to see the DNA present within chromosomes. D) it led to the discovery of mitochondria. E) All of the above are true.
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Ответ:
Sickle cell anemia
Explanation:
The mutation is the reversal of an A-T pair in the DNA that replaces a glutamic acid molecule with a valine in the hemoglobin protein.
The changed hemoglobin molecules clump together and cause the red blood cells to change to a crescent or sickle shape that can block blood vessels.
The decreased number of normal red blood cells causes anemia.