Answer: Here are a variety of sentences you could use...
1. Jensen was born with blue eyes because each of his parents gave him a recessive allele for the trait.
2. The dominant allele is the one that determines a physical characteristic or trait.
3. Because Jill’s parents both gave her the dominant allele for curly hair, she has a wavy hair texture.
4. Which allele is responsible for blonde hair, the recessive allele or the dominant allele?
5. On the other hand, the recessive allele is always overshadowed by its dominant partner.