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.
How is an F′ factor different from an F factor?
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
In fruit flies, curved wings are recessive to straight wings,
What is an advantage and a disadvantage of this repair system?
Explain the type of speciation (allopatric, parapatric, or sympatric
The raw material for evolution is random mutation. Discuss whether or
With regard to the timing of conjugation, explain why the recipient
A woman who is heterozygous, Bb, has brown eyes;
A recessive allele in mice results in an unusally long neck.
Why is an antibody used in this experiment? From
