Across
- 4. a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells
- 5. an organism's physical appearance or visible traits
- 7. different forms of a gene
- 8. passing of traits from parents to offspring
- 10. genetic makeup of an organism
- 12. an organism that has two different alleles for a trait
- 14. an allele that is masked when a dominant allele is present
- 15. DNA segments that serve as the key functional units in hereditary transmission
- 17. a table in which all of the possible outcomes for a genetic cross between two individuals with known genotypes are givene
- 18. Change over time
- 20. any difference between individuals of the same species
Down
- 1. process of making changes in the DNA code of living organisms
- 2. a diagram that shows the occurrence of a genetic trait in several generations of a family
- 3. a new organism produced by one or more parents
- 6. a random error in gene replication that leads to a change
- 9. describes a trait that covers over, or dominates another form of that trait
- 11. nutrients the body uses to build and maintain its cells and tissues
- 13. differences among individuals in the composition of their genes or other DNA segments
- 16. an organism that has two identical alleles for a trait
- 19. a characteristic that an organism can pass on to its offspring through its genes