Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following statement is correct with respect to human sex determination?
NCERT Page No. 86
Mutation causes
NCERT Page No. 87
Sickle cell anaemia is a classic example of
NCERT Page No. 87
In which of the following one may observe variation in DNA?
NCERT Page No. 87
If a normal female has a sickle cell anaemic child what can be the probable genotype of that gene in that female?
Concept NCERT Page No. 89
Sickle cell anaemia means genotype is “aa” and in order to carry both alleles as “a” from normal parents the parents have to be heterozygous, so the mother would be carrying “Aa”.
If the female has three boys in her first three pregnancy. What are the chances of getting female child this time?
Concept - NCERT Page No. 86
The chances of having a baby boy or girl will always be ½ ie. It does not vary with past pregnancies.
If a haemophilic female who marries a normal male gives birth to a male child, then what are the chances of boy being normal? (a hypothetical situation but it won’t happen practically)
Concept - NCERT Page No. 89
If the mother is haemophilic. Her genotype will be XhXh( as haemophilia is X linked recessive disorder). And male child can inherit only X chromosome from mother, so he will inherit Xh from his mother. Now for being haemphilic, one has to get another Xh but for male another sex chromosome will be Y, Here comes the Hemizygous situation. So, in any case, male is going to be haemophilic. No chances of being normal.i.e. 0% chances of male being normal in this situation.
In ABO blood grouping how many genotypes show co-dominance?
NCERT Page No. 77
In ABO blood grouping, IAIB genotype shows co-dominance.
Which of the following is the sex linked disease?
NCERT Page No. 89
Mendelian disorders are caused by
NCERT Page No. 88
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