Which of the following parental combination has produced mutant offspring?
$Tt × tt = Tt$
$tt × tt = Tt$
$Tt × Tt = tt$
$TT × tt =Tt$
Chimera is produced due to
One of the following is sex-influenced character
Persons who are colourblind can not distinguish
Nicotiana sylvestris flowers only during long days and $N$.tabacum flowers only during short days, if raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self-fertile offspring. What is the best reason for considering $N .$ sylvestris and $N$. tobaccum to be separate species?
In a mutational event, when adenine is replaced by guanine, it is the case of
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