The sexually transmitted disease that may produce a chancre is

The sexually transmitted disease that may produce a chancre is syphilis. A chancre is a painless swelling (lesion) on the skin, most probably around the genital area. Syphilis is a sexually transmitted disease (STD) caused by a bacterium. Although it can be treated with antibiotics, if the treatment doesn't start soon enough, syphilis can become a very serious health condition. Its progression involves 4 stages. Syphilis can cause serious damage to the nervous system with symptoms that range from severe headaches to changed behaviour. 

11. gene12. allele13. crossing over14. linked15. gene16. x17. males, femalesapologies if numbers are out of order.