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Unit 7B
Inheritance and Variation
| Term | Definition |
|---|---|
| variation | the differences between the individuals in a species or between groups of organisms of the same species. |
| adaptation | a characteristic of an organism that helps it to survive and reproduce in its environment |
| dominant trait | a characteristic that is expressed (shown) when one allele is inherited |
| recessive trait | a characteristic that is expressed (shown) only when two alleles are inherited |
| allele | one of two ore more forms of a gene, located at a specific position on a chromosome |
| gene | the basic unit of heredity, passed from parent to child; found at a specific position on a chromosome |
| genotype | the genetic makeup of an organism; the combination of alleles present in the DNA of an individual organism |
| phenotype | the observable physical properties of an organism, including appearance, development, and behavior |
| heterozygous | having two different versions of a gene (allele), inherited from each parent |
| homozygous | having the same version of a gene (allele) from both parents |
| Punnett square | a diagram scientists use to show the probability of possible alleles in offspring, if we know the genotypes of the parents |
| capital letter | how to show a dominant trait on a Punnett square |
| lowercase letter | how to show a recessive trait on a Punnett square |
Created by:
PRO Teacher
LMS 8 Sci
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