Cells know how to differentiate through a process called gene expression. It’s a specific combination of genes that are turned on and off.
Duchenne muyscular dystrophy is caused by a mutation on the X chromosome, so a male gets it from his mother's X, if she is a carrier. The male child gets a Y and no X from his father, so the disease is always transmitted through the X from the mother. If a female gets Duchenne muscular dystrophy she has to have two X chromosomes, one from a carrier mother and another from from an affected father. This is virtually impossible because most males die before childbearing age and there is no way a female child can get an X from a man who does not live long enough to procreate. About eight percent of carrier women do show some muscle weakness, but they do not have the disease.
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Yellow eye rock fish, flounder, Vermilion rock fish, wolf eel, Salmon, Lingcod, black pine, Bottlerush algae, bull kelp, Coralllne algae, rockweed, sea cauliflower, sea staghorn, surf grass, Winged kelp, razor clams, moon snail, dungennes crab, octopus, sea star.
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because not every virus or disease has the same DNA or RNA
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because it has something at checks it and allows it to pass
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