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Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

How genes produce proteins that determine traits in a simple dominant-recessive relationship. How genes produce proteins that determine traits in a simple dominant-recessive relationship.
A single crossover cannot produce a viable recombinant A single crossover cannot produce a viable recombinant
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A common autosomal recessive allele can produce a pedigree that looks like an autosomal dominant tra A common autosomal recessive allele can produce a pedigree that looks like an autosomal dominant tra
Video: Non-specific disease resistance mechanisms & Skin's defense barriers

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