The dorsal pigment pattern of frogs can be either "leopard" (white pigment between dark spots) or "mottled" (pigment between spots appears mottled). The trait is controlled by an autosomal gene. Males and females are selected from pure-breeding populations, and a pair of reciprocal crosses is performed. The cross results are shown below.

+2 votes

Cross 1: {\rm P}: Male leopard \times female mottled 
F1 ({\rm F}_{1}): All mottled 
F2 ({\rm F}_{2}): 70 mottled, 22 leopard 
Cross 2: {\rm P}: Male mottled \times female leopard 
F1({\rm F}_{1}): All mottled 
F2({\rm F}_{2}): 50 mottled, 18 leopard



Part A
Which of the phenotypes is dominant?
Part B
Are the results of the reciprocal crosses consistent with autosomal inheritance of
dorsal pigment patterns? 
Part C
In the F2 ({\rm F}_{2})  progeny from both crosses, what proportion is expected to be homozygous?
Part D
In the  F2 ({\rm F}_{2}) progeny from both crosses, what proportion is expected to be heterozygous? 



asked Nov 21, 2012 in Genetics by GeneX ~Top Expert~ (7,947 points)

1 Answer

+1 vote
Part A:



Part B:



Part C:



Part D:

answered Nov 21, 2012 by GeneX ~Top Expert~ (7,947 points)

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