Genetics and heredity

3. a particle in a cell that helps synthesize proteins
4. type human blood cells that have the same antigens
5. cell division that produces reproductive cells
6. part of DNA controlling physical characteristics and growth
8. allele an allele that produces its characteristic phenotype only when its paired allele is identical
11. allele an allele that is almost always expressed, even if only one copy is present.
14. material that carries genetic information in a cell
15. traits are attributable to genotypic variation in a person's DNA sequence
17. a specialized part of a cell; analogous to an organ
18. observable characteristics produced by genes and environment
19. having dissimilar alleles at corresponding chromosomal loci

1. part of a cell involved in energy production
2. a threadlike strand of DNA that carries genes
6. expression conversion of the information encoded in a gene first into messenger RNA and then to a protein
7. traits are attributable to genotypic variation in a person's DNA sequence.
9. DNA sequence of a gene's DNA that transcribes into protein structures
10. a change or alteration in form or qualities
12. any of the forms of a gene that can occupy the same locus
13. of or pertaining to a recession
16. having identical alleles at corresponding chromosomal loci