Question

The stages in proper sequence of prophase I are
A. diplotene $ \to $ diakinesis $ \to $ pachytene $ \to $ zygotene $ \to $ leptotene
B. leptotene $ \to $ zygotene $ \to $ pachytene $ \to $ diplotene $ \to $ diakinesis
C. leptotene $ \to $ pachytene $ \to $ zygotene $ \to $ diakinesis $ \to $ diplotene
D. zygotene $ \to $ leptotene $ \to $ pachytene $ \to $ diakinesis $ \to $ diplotene

Answer 1

Hint: It is the first stage of cell division in both the mitosis and meiosis. This meiosis involves two rounds of chromosome segregation and then it undergoes prophase twice and thus resulting in prophase I and prophase II. Prophase I is the most complex phase in all meiosis because it is a homologous chromosome and must pair and exchange genetic information.

Complete answer:
The five stages of prophase I are leptotene, zygotene, pachytene, diplotene, diakinesis. In mitotic prophase many of the events occur inside these phases such as pairing of homologous chromosomes and then the reciprocal exchange of genetic material within these homologous chromosomes. This prophase I are occurs at different speed based on the species and sex.
The Leptotene is the first stage of prophase I. It is based on chromosomes that begin to condense. In the state it consists of two sister chromatids. The homologous regions inside homologous chromosome pairs begin to associate with each other. The second stage of prophase I is Zygotene. They are all maternally and also paternally derived chromosomes have found their homologous partner. Then this homologous pair undergo synapsis, It is a process by which synaptonemal complex aligns the region of genetic information on both maternally and paternally derived non sister chromatids of homologous chromosomes.
The third phase of prophase I is pachytene. It is the one which begins the completion of synapsis. Chromatin is condensed enough so that the chromosomes can now be resolved in the microscopy. The four stage is Prophase I is Diplotene. In this the homologous chromosome retains the full set of genetic information, anyhow this homologous chromosomes are mixed with maternal and paternal descent. The five stage of prophase I is Diakinesis. In this the full chromatin condensation has occurred in all four sister chromatids can be seen in bivalents with microscopy.

Hence, the correct answer is option (B).

Note: The notable difference between prophase in both plant cells and animal cells is it occurs because plant cells lack centrioles. The next notable difference is preprophase is an additional step in the plant mitosis that finally results in the formation of a preprophase band. It is a structure composed of microtubules. This band disappears in the mitotic prophase I of plants.