Leptotene is the first stage that happens in the prophase of meiosis I. Meiosis is the process of cell division in which the genetically diverse sex cells are formed. These sex cells are also termed as gametes which are haploid in number. Meiosis is composed of two divisions i.e. meiosis I and meiosis II which occur successively.
The first phase in meiosis I is prophase I which has further five substages namely leptotene, zygotene, pachytene, diplotene, and diakinesis. The chromosomes start getting condensed in the nucleus in order to form long strands. At this stage, the chromosomes become apparent. But the two sister chromatids of the chromosome are closely associated with each other and appear to be one and hence are indistinguishable.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
