Genetics

2. developed during an organism's lifetime through experiences and learning; cannot be inherited
4. two egg cells and two sperm cells; twins have as much in common with each other as any siblings
5. involves one parent and offspring is genetically identical to the parent
8. loose strands of DNA
9. a change in the DNA sequence
13. a genetic disorder caused by a mutation in the gene that makes connective tissue
14. one sperm fertilizes one egg cell then the fertilized egg splits into two embryos
18. physical appearance
19. choosing two parents to mate in order to produce an offspring with a desired trait
20. a section of DNA that codes for a particular trait
21. the allele that gets covered up if the dominant allele is present
23. a type of cell division that produces four egg cells or four sperm cells
24. DNA is altered to produce a desired trait
25. each parent has unique genes, so the offspring will get a mixture of both

1. genetic makeup
3. pollen from a flower fertilizes the egg in the same flower
6. fertilized egg cell
7. the allele that shows up if it is present
10. pollen from a flower fertilizes the egg from a different flower
11. an inherited behavior an organism an organism is born knowing how to do
12. two identical copies that make up a chromosome after DNA replication
15. a set of instructions to build an organism
16. a cell division process that produces two genetically identical cells
17. both parents have similar genes, so the offspring are similar to both parents
22. made of coiled and thickened chromatin