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Boy born to a physically normal couple has been diagnosed with a genetic disorder, this could be
NCERT Page No. 89
Normal mother has to be a carrier for it as the male progeny inherits the X chromosome from his mother so only the case of X- linked recessive will support the diseased male (hemizygous condition refer to logic of Q. 80).
Which of the following disorder is associated with Queen Victoria?
NCERT Page No. 89
Recessive disorders will be transmitted only if both the parents are carriers or diseased.
Which of the following is least probable?
NCERT Page No. 89
Elongated sickle like structure of RBC is produced by
NCERT Page No. 89
Sickle cell anaemic person will have
NCERT Page No. 89
Mental retardation is associated with
NCERT Page No. 90
Which of the following statements are correct with respect to aneuploidy?
(i) Aneuploidy is caused due to failure of segregation of chromatids
(ii) Aneuploidy is caused by due to failure of segregation of alleles
(iii) Aneuploidy results into loss or gain of chromosomes.
(iv) Aneuploidy always results into gain of chromosomes.
(v). Down’s syndrome is caused due to aneuploidy in chromosome 21.
NCERT Page No. 90
Which of the following statements are correct?
(i) Polyploidy is caused due to failure of cytokinesis after telophase.
(ii) polyploidy results into increase in number of autosomes
(iii) Turner’s syndrome is an example of polyploidy
(iv) polyploidy results into an increase in a whole set of chromosomes
NCERT Page No. 90
A man who is achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X- linked recessive. What proportion of their sons would be color-blind and of normal height ?
The equivalent of a structural gene is
Cistron is the segment of DNA which determines the synthesis of complete polypeptide. Thus, it is considered as equiaveltn to a structural gene. Therefore, option is correct and others are incorrect.
Concept Enhancer - Eukaryotic structural gene is monocistronic whereas prokaryotic structural gene is polycistronic.
Muton - Smallest unit of DNA in which mutation occurs.
Operon - Functional unit of genomic DNA containing a cluster of genes under condtrol of single promoter.
Recon - Smallest unit of DNA for recombination.
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