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Which of the following statements is/are correct?

a. Genes are thread-like structures in the nucleus of a cell formed of DNA, which carries the chromosomes.
b. The dominant gene decides the appearance of an organism even in the presence of an alternative gene.
c. The recessive gene decides the appearance of a person in the presence of the dominant gene.

 
a only
b only
c only
b and c
a and c

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When the pair is Tt, T is expressed and when the pair is tt, t is expressed. hence b and c both are correct. but genes are present in chromosomes, not the chromosomes in the gene. hence a is incorrect.

Recessive allele Allele that is only expressed in absence of a dominant allele. how that statement is wrong