Which best describes the function of the part labeled b?
carries all the genetic information of the organism
provides the master instructions for the cell
joins sister chromatids
codes for a specific trait

Image is not available in the question so, the correct image is attached below.

D. codes for a specific trait

Explanation:

chromosome is defined as a DNA molecule found in the nucleus of most living cells which carry genes and transfer the genetic information.

The part labelled b in the image is gene. The function of gene is to code for a specific trait.

Genes are responsible for carrying traits that  form the genotype and phenotype of an organism. where genotype shows the differences in genetic formation and phenotype shows observable characters in an individual such as color, height and features.

Hence, the correct option is D.

yes i have all the correct answers

1. c 6. b. 11. c

2. a 7. d. 12. d

3. c 8. b. 13. c

4. d 9. c. 14. d

5. c 10. d. 15. a

16. d. 21. a

17. d.

18. a. 22-30 you must do on

19. d. your own

20. d.