Multiple Choice QuestionsIn rabbits, the gene for grey fur (G) is dominant over that for black fur (g). In a litter, if 50% rabbits are grey, then the possible parental cross combination is
GG x Gg
gg X gg
GG x GG
Gg x gg
Barr body is missing in the female suffering from
Huntington's disease
Tay-sach's disease
Klinefelter's syndrome
Turner's syndrome.
Which is genetically not possible
Haemophilic father transfers the haemophilic gene to his son.
Haemophilic father transfers the haemophilic gene to his daughter.
Carrier mother transfers the haemophilic gene to her son.
Carrier mother transfers the haemophilic gene to her daughter
A.
Haemophilic father transfers the haemophilic gene to his son.
Haemophilia is a sex linked disease. It follows criss-cross inheritance in which father does not pass the sex-linked allele of a trait to his son. The same is passed to the daughter, from where it reaches the grandson, i.e., diagynic. It is because the males have only one X-chromosome which is transferred to the female offspring. Only Y-chromosome of the father is transferred to the male offspring but this sex chromosome does not carry the allele for haemophilia. Mother passes the alleles of a sex-linked trait to both sons and daughters.
If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ?
All will exhibit dominant phenotype
All will exhibit recessive phenotype
Dominant and recessive phenotypes will be 50% each
Dominant phenotype will be 75%
Assertion : Foetal disorders can be diagnosed by chorionic villi sampling.
Reason : Karyotyping can be done for mitotically dividing cells of chorionic villi.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Curdling is required in the manufacture of cheese.
Reason : Lactic acid bacteria are used for the purpose.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Number of chromosomes in one genome is equal to number of linkage groups.
Reason : Linkage groups give important information about the location of genes in the chromosomes.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
Which of the following occurs due to monosomy of sex chromosome
Down's syndrome
Turner's syndrome
Haemophilia
Sickle cell anaemia
Which of the following is true for a recessive disease in Family A and B?
In family A, both the parents are homozygous recessive
In family B, both the parents are heterozygous dominant.
In family B, both the parents are heterozygous recessive
In family A, both the parents are heterozygous recessive.
Assertion: In a pedigree analysis, <5> represents five unaffected offsprings.
Reason: In a pedigree analysis, the offsprings are numbered with arabic numerals (1, 2, 3 .....) and a generation is numbered with roman numerals (I, II, III...).
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
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