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Part III: Non-Mendelian Genetics 1.   In four-o’clock flowers red petals are incompletely dominant over white petals,...


Part III: Non-Mendelian Genetics
1.   In four-o’clock flowers red petals are incompletely dominant over white petals, producing pink petal flowers in the heterozygous stage. What would be the probability of having white offspring if two pink flowered plants were crossed?

2.   In humans, there are three alleles for blood types, A = IA, B = IB, and O = i. Type A and B are co-dominant alleles and type O is recessive. Could a man with type AB blood be the father of a child with type O blood if the mother was heterozygous for type A blood?


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Answer #1

1.Ans. Red flower genotype = RR

White flower genotype = rr

Pink flower genotype = Rr

Crossing between two pink flowers (Rr) is shown below-

R r
R RR(red) Rr(pink)
r Rr (pink) rr ( white)

The probability of white flowers when two pink flowered plants are crossed = 1 white flower out 4

i.e. 25% white flowers.

2.Ans. No, a man with type AB blood can not be father of a child with type O blood. It is because type AB blood can not inherit " i " which is required for type O blood in childenchilden and hence no chance of producing type O blood child irrespective of blood group of the mother.

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