A cross gives a 3:1 phenotypic ratio. What are the genotypes of
What are the genotypes of the parents?

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?

Can someone give me the answers to this?

Spirochetes have a twisting and flexing locomotion due to appendages called