Tag: compatibility of blood groups

Questions Related to compatibility of blood groups

In which of the following situations, is there a risk factor for children of incurring erythroblastosis foetalis?

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  1. Mother is Rh -ve and father is Rh -ve.

  2. Mother is Rh -ve and father is Rh +ve.

  3. Mother is Rh +ve and father is Rh +ve.

  4. Mother is Rh +ve and father is Rh -ve.

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Correct Option: B
Explanation:

There are two main causes of erythroblastosis fetalis: Rh incompatibility and ABO incompatibility. Rh incompatibility occurs when a Rh-negative mother is impregnated by a Rh-positive father. The result can be a Rh-positive baby. In such a case, your baby’s Rh antigens will be perceived as foreign invaders, the way viruses or bacteria are perceived. Your blood cells attack the baby’s as a protective mechanism that can end up harming the child. If you’re pregnant with your first baby, Rh incompatibility isn’t as much of a concern. However, when the Rh-positive child is born, your body will create antibodies against the Rh factor. These antibodies will attack the blood cells if you ever become pregnant with another Rh-positive baby.


So, the correct option is 'Option B'.

Rh factor may be responsible for

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  1. Turner's syndrome

  2. Accquired Immuno Deficiency Syndrome

  3. Sickle cell anaemia

  4. Erythroblastosis foetalis

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Correct Option: D
Explanation:

Erythroblastosis foetalis is a disease of the new born which is caused by Rh incompatibilty. This happens when mother is Rh negative and the child she is bearing is Rh positive. Thus the Rh antigen of child can trigger the antibodies inside mother which can travel through circulation thus destroying foetus blood cells. Thus, correct answer is option D.

Several copies of genes carrying the contrasting characters are mainly included in which of the following laws?

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  1. Law of independent assortment

  2. Law of segregation

  3. Multiple allelism

  4. None of the above

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Correct Option: C
Explanation:
Alleles are alternative forms of a gene. They are responsible for differences in phenotypic expression of a given trait. When a gene exists in three or more allelic forms it is called multiple allele. 
For example, ABO blood group system in humans is controlled by three alleles  I$^A$, I$^B$, and  I$^O$
IA and IB are codominant and make type A and type B antigens, respectively. IO is the recessive allele and produces no antigen.The blood groups arising from the different possible genotypes is given below.
Genotype                         Blood Group
I$^A$ I$^A$                        A
I$^A$ I$^O$                       A
I$^B$ I$^B$                        B
I$^B$ I$^O$                       B
I$^A$ I$^B$                      AB
I$^O$ I$^O$                      O
So, the correct answer is 'Multiple allelism'

Multiple alleles are situated at 

zoology inherited changes compatibility of blood groups blood group blood groups and compatibility advance

  1. Homologous chromosme at same locus

  2. Homologous chromosome at different locus

  3. Non-homologous chromosome at different locus

  4. None of the above

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Correct Option: A
Explanation:

Alleles are alternative forms of a gene. They are responsible for differences in phenotypic expression of a given trait. When a gene exists in three or more allelic forms it is called multiple allele. Homologous chromosomes are chromosome pairs, one from each parent. They are similar in length, gene position and centromere location. Multiple alleles are situated in homologous chromosome at the same locus. Thus the correct answer is option A.

If both parents are albino, all the offspring shall be

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  1. Albino

  2. Some albino, some normal

  3. Homozygous normal

  4. Heterozygous normal

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Correct Option: A
Explanation:

Albinism is a autosomal genetical recessive gene disorder. It occurs in homozygous recessive state. The gene for albinism is a. it does not produce the enzyme tyrosinase, but is normal Allele A is does. Thus only homozygous individuals (aa) is affected. When both parents are albinic, all the offsprings also albinic generally.

So, the correct option is ‘Albino’.

When the heterozygote in a population have a reproductive advantage, one can predict that _________________.

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  1. They will produce only heterozygous offspring

  2. The individuals that are homozygous recessive will take over

  3. Both homozygous dominant and homozygous recessive individuals will continue to appear in future generations

  4. Homozygous dominant and homozygous recessive individuals will be completely eliminated

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Correct Option: A

Multiple gene inheritance takes into account ______________.

zoology inherited changes compatibility of blood groups blood group blood groups and compatibility advance

  1. Discontinuous traits

  2. Continuous traits

  3. Co-dominance

  4. Incomplete dominance

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Correct Option: A