Spotting in horses is dominant. SS and Ss spotted, ss - solid. Black color is do

Question

Spotting in horses is dominant. SS and Ss spotted, ss - solid. Black color is dominant over red. BB and Bb black, bb red. Now, imagine that two horses are heterozygous for BOTH traits. So they are both SsBb. Complete a Punnett square to help you determine the offspring genotypes and phenotypes, and fill in the following blanks. PHENOTYPES out of every 16 offspring should be spotted and black out of every 16 offspring should be spotted and red. 3 out of every 16 offspring should be solid and black. 1 out of every 16 offspring should be solid and red. GENOTYPES: out of every 16 offspring should be SS88 (homozygous dominant for both) 2 out of every 16 offspring should be SSBb 1 out of every 16 offspring should be SSbb 2 out of every 16 offspring should be SsBB out of every 16 offspring should be SsBb (heterozygous for both) 2 out of every 16 offspring should be Ssbb 1 out of every 16 offspring should be ssBB out of every 16 offspring should be ssBb 1 out of every 16 offspring should be ssbb

Explanation / Answer

Q) In the question Spotting is dominant in horses and Black color is a dominant character.

SS,Ss are spotted, ss is solid , BB,Bb are Black bb is Red

SsBb crossed with SsBb (Both are heterozygous )

SsBb will give rise to four types of Gametes they are = SB, Sb, sB, sb

When we take these gametes in a punette square , The punette square will be

Phenotypes -

9 out of every 16 offsprings should be Spotted and Black.

3 out of every 16 offsprings should be spotted and Red.

3 out of every 16 offspring should be solid and black.

1 out of every 16 offspring should be solid and Red.

Genotypes -

1 out of every 16 offspring should be SSBB.(homozygous dominant).

2 out of every 16 offspring should be SSBb.

1 out of every 16 offspring should be SSbb.

2 out of every 16 offspring should be SsBB.

4 out of every 16 offspring should be SsBb (heterozygous for both).

2 out of every 16 offspring should be Ssbb.

1 out of every 16 offspring should be ssBB.

2 out of every 16 offspring should be ssBb.

1 out of every 16 offspring shoud be ssbb.

SB Sb sB sb SB SSBB (Spotted Black) SSBb(Spotted Black) SsBB(Spotted Black) SsBb(Spotted Black) Sb SSBb(spotted Black) SSbb(spotted Red) SsBb(Spotted Black) Ssbb(Spotted Red) sB SsBB(Spotted Black) SsBb(Spotted Black) ssBB(Solid Black) ssBb(Solid Black) sb SsBb(Spotted Black) Ssbb(Spotted Red) ssBb(Solid Black) ssbb(Solid Red)

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