Question

Hagrid, the Hogwarts gamekeeper, is fascinated with dragons. A true-breeding Common Welsh Green Dragon with green scales (b+), brown eyes (p+) and a smooth tail (s) was crossed to a true-breeding Hebridean Black Dragon with black scales (b), purple eyes (p) and a spiked tail (s+). All of the F1 dragons had green scales, brown eyes and a smooth tail. When the green scaled, brown eyed and smooth tailed F1 females were crossed to true-breeding black scaled (b), purple eyed (p), spiked tail (s) males the following results were obtained. Please answer the following questions.

Scale Color Black (b) vs Green (b+)	Eye Color Purple (p) vs Brown (p+)	Tail Spiked (s) vs Smooth (s+)	Number
b+	p	s+	12
b	p+	s	15
b+	p	s	10
b	p+	s+	14
b+	p+	s	235
b	p	s+	239
b	p	s	236
b+	p+	s+	239
		total	1000

Show the configuration of these three genes including the distance between any linked genes.

Answer 1

Answer-

Gene b and p are linked whereas, gene s is present on different chromosome or it is very far from other two genes.

Map distance between b and p is 5.1 mapunits.

The explanation is given below: