Barr bodies are
Chromatin negative
Not influenced by stains
Chromatin positive
Poorly staining
Gynaecomastia condition can develop due to
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children ($2$ daughters and $5$ sons). Three of the sons suffer from the given disease but none of the daughters are affected which of the following mode of inheritance do you suggest for this disease
Philadelphia chromosome is
When a plant of $F_1$ generation is crossed with homozygous dominant parents, it is known as
Which one of the following mutation partially or fully reverses the harmful effects of previous mutation