Science for Kids/8th Grade Science
QUESTION: In humans, the allele for curly hair and the allele for straight hair show incomplete dominance. The offspring of a curly haired person and a person with straight hair will have what kind of hair?
ANSWER: about halfway between curly and straight. We call it "wavy"
Similar to skin color. The offspring of a person with very pale skin and someone with very dark skin will be someone with in-between color skin.
---------- FOLLOW-UP ----------
QUESTION: How can an offspring inherit a recessive trait.
Blue eyes are recessive in humans to the dominant trait of brown eyes.
Let's say your mom has blue eyes, which means she has two blue-eyed genes.
You will get a gene for eye color from your dad. It may be blue or brown. But since your mom has only blue genes, you will get a blue eyed gene from her.
In order for you to have blue eyes, you must get a blue eyed gene from your dad. If he has blue eyes, then you will definitely get a blue eyed gene from him. But if he has brown eyes, you may get a brown or blue gene from him. If he is homozygous for brown (he has two brown eyed genes), then you will get a brown from him. But if he is heterozygous for brown (one brown gene and one blue gene), then you have a 50-50 chance of getting a blue eyed gene from him.