Vocabulary

4. Another form of saying heterozygous.
6. A trait that is able to take over a recessive trait only if one dominant trait is expressed.
8. The study of hoe traits are passed down from parents to their offspring.
11. The physical traits of an organism.
13. A trait that will only be expressed if two copies of the recessive allele is present.
14. Exposure to substances that may change habits.
15. A segment of DNA that carries instructions for a specific trait.
16. When two organisms mix their DNA to form another organism.
17. Squares A tool scientists use to predict the possible outcomes of a genetic cross between two organisms.

1. Refers to having two identical alleles for a specific gene.
2. The genetic makeup of an organism.
3. Refers to having two different alleles for a specific gene.
5. A trait that will be expressed in an organism's phenotype even if only one allele for that gene is present.
7. Various forms of the same gene.
9. A trait that is only passed down if there is only two of that same trait.
10. Things passed down from parents to offspring through genes.
11. Another form of saying homozygous.
12. The record of descent of an animal, showing it to be purebred.