Chiasmata firstly seen in
Leptotene
Zygotene
Pechytene
Diplotene
(d) Chiasmata firstly seen in diplotene substage of prophase $I$.
In which of the sex determination both male and female have same number of chromosomes?
The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from
Extranuclear inheritance is a consequence of presence of genes in
The defect sickle-cell anaemia is caused by the ______ of glutamic acid by valine at the $6^{th}$ position of the ______ globin chain of the haemoglobin molecule.
The chromosomes responsible for the determination of sex are called
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