Explanation:
In the majority of cases, the extra copy of chromosome 21 comes from the mother in the egg.
In a small percentage (less than 5%) of cases, the extra copy of chromosome 21 comes from the father through the sperm.
In the remaining cases, the error occurs after fertilization, as the embryo grows.
1. Treatable by a medical professional
2. Requires a medical diagnosis
<span>3. Lab tests or imaging always required
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Answer:
Light is refracted when it crosses the interface from air into glass in which it moves more slowly.
Explanation:
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The hair would be curly because if h is recessive and H is just curly, that hair is gonna stay the same.
