11. These terms are no longer in use but have contributed to the current understanding of pleiotropy . 12. Williams ( 1957 ) proposed his own theory, called antagonistic " pleiotropy ". 13. There are three types of pleiotropy : molecular gene pleiotropy, developmental pleiotropy, and selectional pleiotropy. 14. There are three types of pleiotropy : molecular gene pleiotropy , developmental pleiotropy, and selectional pleiotropy. 15. There are three types of pleiotropy : molecular gene pleiotropy, developmental pleiotropy , and selectional pleiotropy. 16. There are three types of pleiotropy : molecular gene pleiotropy, developmental pleiotropy, and selectional pleiotropy . 17. Developmental pleiotropy is a mutational pleiotropy observing the relationships between mutations and different phenotypes, excluding fitness. 18. Developmental pleiotropy is a mutational pleiotropy observing the relationships between mutations and different phenotypes, excluding fitness. 19. In 1957, evolutionary biologist antagonistic pleiotropy contributes to the slow deterioration with age ( senescence ). 20. This was another setback for pleiotropy theory, though Rose maintains it may be an experimental artifact.
