Agenetic disorder in which part of the x chromosome seems to be attached to the rest of it by a very thin string of molecules is

fragile X syndrome

Explanation:

FMR1 gene mutations trigger fragile X syndrome.The gene FMR1 offers instructions on how to make a  protein called FMRP.

This gene helps to control the output of other proteins and plays a  part in the growth of synapses that are specific nerve cell connections.

It creates a variety of developmental issues including intellectual disabilities and  cognitive impairment. This disease usually affects males more significantly than women.

i think that it is plants

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?