A black coloured cock when bred with a white coloured hen , produced steel-blue offspring When the steel-blue coloured offspring were bred :black , white and steel-blue progeny were obtained.

explain with the help of a cross.

what will be the expected ratio of black, steel blue and white progeny?

name the cross.

Dear student

Please refer the solution below for the said query

 Let the genotype of black coloured cock be BB and white coloured hen be bb. The cross can be represented as:

Parents                     BB          x           bb
                        (Black cock)         (White hen)

Gametes                    B                         b

F₁                                        Bb (Steel-blue)

Selfing            Bb                x              Bb

Gametes      B,  b                           B,     b

F₂             

	B	b
B	BB (Black colour)	Bb (Steel-blue
b	Bb (Steel-blue)	bb (White)

 

1. The expected ratio of black, steel blue and white progeny is 1:2:1
2. It is an incomplete dominance. 

Hope this information clears your doubt about the topic.

Regards