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ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

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DOES ANYONE have the OMR SHEET?? the MCQ question paper where u fill up the circles? if u do upload them here.. thanks alottttt
 
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0610_w10_qp_11
Q) 30

In some animals, B is the allele for normal skin (without spots) and b is the allele for spotted skin.
A pair of these animals has 37 offspring, 18 with spots and 19 without.

What are the most likely genotypes of the parents?
A) BB × BB B) Bb × Bb C) Bb × bb D) bb × bb

Answer is C, someone please explain this to me very carefully? I hate these type of Qs :(
 
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That means half r spotted and half r not spotted(normal)... So the genotype of the offspring is Bb and bb so how can we achieve that... look for the 2 parent genotypes that give the offsprings Bb and bb .. so

If u cross Bb and bb u will get 2 Bb and 2 bb therefore answer is C... i know this is very complicated but these questions come all the time u have to understand them welll and revise genetics
 
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That means half r spotted and half r not spotted(normal)... So the genotype of the offspring is Bb and bb so how can we achieve that... look for the 2 parent genotypes that give the offsprings Bb and bb .. so

If u cross Bb and bb u will get 2 Bb and 2 bb therefore answer is C... i know this is very complicated but these questions come all the time u have to understand them welll and revise genetics

Got it! Cheers, but erm... you say half are spotted and half are not - even though it is 18 and 19? Or does that not matter?
 
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IGCSE Biology June 1994 Questions 4 and 23. Need explanations.
Assalam-o-alaikum wr wb...
m not sure about Q4 but 23 is here :)
june-1994-q23-jpg.12541
 
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