The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from
$2 : 2 : 2 : 2$ arrangement of ascospores in Neurospora
$4 : 4$ arrangement of ascospores in Neurospora
Studies of meiosis in maize
Studies on linkage maps of chromosomes in Drosophila
Milk secretion and beard growth, both the traits are
If the ratio between $X$-chromosomes and complete set of autosome is $0.5$. Then the individual will be
Which of the statement is correct
Absence or excess or abnormal arrangement of one or more chromosomes results in
Discontinuous variations are