Blood Group O: Identifying Impossible Parental Genotypes
The question asks for the parental genotype combination that cannot produce a child with blood group 'O'. Blood group 'O' is determined by the genotype $ii$. To find the impossible combination, we need to analyze the possible offspring genotypes from each parental pairing.
Option 1 Analysis: Father: $I^A i$, Mother: $I^A i$
Parents with genotypes $I^A i$ (Blood group A) can produce the following gametes:
- Father: $I^A$, $i$
- Mother: $I^A$, $i$
Possible offspring genotypes are:
- $I^A I^A$ (Blood group A)
- $I^A i$ (Blood group A)
- $I^A i$ (Blood group A)
- $ii$ (Blood group O)
This combination is possible.
Option 2 Analysis: Father: $I^B i$, Mother: $I^B i$
Parents with genotypes $I^B i$ (Blood group B) can produce the following gametes:
- Father: $I^B$, $i$
- Mother: $I^B$, $i$
Possible offspring genotypes are:
- $I^B I^B$ (Blood group B)
- $I^B i$ (Blood group B)
- $I^B i$ (Blood group B)
- $ii$ (Blood group O)
This combination is possible.
Option 3 Analysis: Father: $I^A I^B$, Mother: $I^A i$
Parents with genotypes $I^A I^B$ (Blood group AB) and $I^A i$ (Blood group A) can produce the following gametes:
- Father: $I^A$, $I^B$
- Mother: $I^A$, $i$
Possible offspring genotypes are:
- $I^A I^A$ (Blood group A)
- $I^A i$ (Blood group A)
- $I^B I^A$ (Blood group AB)
- $I^B i$ (Blood group B)
This combination cannot produce the $ii$ (Blood group O) genotype, as neither parent can contribute the 'i' allele exclusively to form the $ii$ genotype. The father only provides $I^A$ or $I^B$, and the mother provides $I^A$ or $i$. To get $ii$, both parents must provide an $i$ allele.
This is the impossible combination.
Option 4 Analysis: Father: $I^A i$, Mother: $I^B i$
Parents with genotypes $I^A i$ (Blood group A) and $I^B i$ (Blood group B) can produce the following gametes:
- Father: $I^A$, $i$
- Mother: $I^B$, $i$
Possible offspring genotypes are:
- $I^A I^B$ (Blood group AB)
- $I^A i$ (Blood group A)
- $I^B i$ (Blood group B)
- $ii$ (Blood group O)
This combination is possible.
Similar Questions
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B. An unfertilized egg develops as a male by parthenogenesis.
C. A male has half the number of chromosomes than that of a female.
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Important Questions from Genetics
- Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule ?
- Match List I with List II :
List I List II A. Incomplete dominance I. Human skin colour B. Co-dominance II. Inheritance of flower colour in Antirrhinum sp. C. Pleiotropy III. Phenylketonuria disease in humans D. Polygenic inheritance IV. ABO blood groups
Choose the correct answer from the options given below : - Which of the following statements are true with reference to the sex-determination in honeybees ?
A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker).
B. An unfertilized egg develops as a male by parthenogenesis.
C. A male has half the number of chromosomes than that of a female.
D. Males produce sperms by meiosis.
E. Honeybees have a haplodiploid sex-determination system.
Choose the correct answer from the options given below : - In which animal do haploid cells divide mitotically to produce gametes ?
- What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for 'A' and 'B' blood group, respectively ?
