Question

You have entered the exotic bird market and wish to breed a Cockatoo with the striking Rose Breast and a Crest of feathers (crested) on its head. You obtain a true-breeding female Rose Breasted Cockatoo (Rose breast but no crest) and a true-breeding male Umbrella cockatoo (White breast and Crested). All of the F1 birds have a rose breast and a crest. When the F1 birds are breed you obtain the following offspring.

F2 offspring.

2 rose breasted, no crest females

6 rose breasted, crested females

1 white breasted, no crest males

3 white breasted, crested males

1 rose breasted, no crest males

3 rose breasted, crested males

16 total

Group of answer choices

genotype of a white breasted cockatoo

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

genotype of a rose breasted cockatoo

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

genotype of a crested cockatoo

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

genotype of a non-crested cockatoo

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

mode of inheritance of Breast Color

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

mode of inheritance of Crest

      [ Choose ]            X linked dominant            XR Y            autosomal dominant            cc            Xr Xr            C-            autosomal recessive            X linked recessive            XrXr        

Answer 1

1. Genotype of a white breasted cockatoo = XrXr     
2. Genotype of a rose breasted cockatoo = XRY
3. Genotype of a crested cockatoo = C_
4. Genotype of a non-crested cockatoo = cc
5. Mode of inheritance of Breast Color = X-linged recessive (white breast)
6. Mode of inheritance of Crest = Autosomal dominant (crest)

Explanation:

Answer:

Rose breast is X-linked dominant (XR) dominant over white breast (Xr).

Crested (C) is an autosomal dominant over no crest (c).

Female Rose Breasted Cockatoo (Rose breast but no crest) =XRXR; cc

A true-breeding male Umbrella cockatoo (White breast and Crested) = XrY; CC

XRXR; cc (female) x (male) XrY; CC ---Parents

F1:

	Xr; C	Y C
XR c	XRXr; Cc (rose breast, crest-female)	XRY; Cc (Rose breast, crest—male)

XRXr; Cc (F1 female) x (F1 male) XRY; Cc

	XR C	XRc	YC	Yc
XRC	XRXR; CC (rose breased, crest)	XRXR; Cc (rose breast, crest)	XRY; CC (rose breast, crest)	XRY; Cc (rose breast, crest)
XRc	XRXR; Cc (rose breast, crest)	XRXR; cc (rose breast, no crest)	XRY; Cc (rose breast, crest)	XRY; cc (rose breast, no crest)
XrC	XRXr; CC (rose breased, crest)	XRXr; Cc (rose breast, crest)	XrY; CC (white breased, crest)	XrY; Cc (white breast, crest)
Xrc	XRXr; Cc (rose breast, crest)	XRXr; cc (rose breast, no crest)	XrY; Cc (White breast, crest)	XrY; cc (white breast, no crest)
	Female		Male

Rose breast, no crest Female = 2

Rose breast, crest Female = 6

White breast, no crest male = 1

White breast, crest Female = 3

Rose breast, no crest Female = 1

Rose breast, crest Female = \