I please need help with C. and D. Thank you. I don\'t know how to set up a dihyb

Question

I please need help with C. and D. Thank you. I don't know how to set up a dihybrid cross of this type.

2416 Calico Cat Lab Name Dr. Mary Kelaita 1. Cat fur coat color genetics are interesting. Orange fur is dominant (B) to black fur (b) and piebald, which is white spotting, is dominant (S) to non-white-spotted (s). Both of those genes are located on the X chromosome. In addition, in cats, somatic cells exhibit X-inactivation randomly, which explains why there are tortoiseshell cats (when heterozygous, has orange and black spots) as well as calico cat:s orange and black but also with white spots)) An orange and white spotted male mated with a ortoiseshell female BS a. State the genotype of dad kitty Orange bblockree b. State the genotype of mom kitty Draw a dihybrid punnet square to show possible offspring c. on-wht Spots -recessive Femole d. Calculate the probability of having calico female kitties:yXXX x® male emolo

Explanation / Answer

Orange white spotted male is mated with tortoise shelled female

XBS-

XB-S

XBs

XB-S-

XBs

XBS XBS-

XBS XB-S

XBs XBS

XBS XB-S-

XBS

XBSXBS-

XBS XB-S

XBS XBS

XBS XB-S-

Y

XBS- Y

XB-S Y

XBS Y

XB-S- Y

Y

XBS- Y

XB-S Y

XBS Y

XB-S- Y

Calcio female : six out of eight females will be calico because of the genotype : XBS XB-S-

So, the ratio will be 6/8 = 3/4

XBS-

XB-S

XBs

XB-S-

XBs

XBS XBS-

XBS XB-S

XBs XBS

XBS XB-S-

XBS

XBSXBS-

XBS XB-S

XBS XBS

XBS XB-S-

Y

XBS- Y

XB-S Y

XBS Y

XB-S- Y

Y

XBS- Y

XB-S Y

XBS Y

XB-S- Y

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