Boys can inherit the recessive allele (c) that causes red-green colour blindness from their mother, not from their father. the allele for normal red and green vision is c. which of the following genotypes are possible in men?
c only c only
b. c or c only
c. cc or cc only
d. cc, cc or cc only

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.