Congenital Deafness in Humans Is Due to the Homozygous Condition

Essay

Congenital deafness in humans is due to the homozygous condition of either of the recessive genes d or e, or both of these genes.Both dominant D and E are necessary for normal hearing.Gene D/d affects the middle ear, while gene E/e affects the inner ear.It does not matter how good the normal inner ear (as indicated by E__) is; if there is something wrong in the middle ear, the individual is unable to hear.The same applies for the other gene.Give the phenotypic results of the following crosses:
(a)
Dd EE * Dd EE
(b)
Dd Ee *Dd Ee
(c)
dd EE * DD ee
(d)
Dd EE *Dd ee
(e)
Dd EE * DD Ee