- Procentric synapsis: Combining initiate in the middle of chromosome.
- Proterminal synapsis: Pairing initiate regarding telomeres.
- Random synapsis: Pairing will start at any place.
Question 40. How and you will where chiasma is made? Answer: Shortly after tetrad creation, crossing over occurs in the pachytene phase. This new non-aunt chromatids of your own homologous couple create a contact during the you to definitely or even more items. These types of factors away from get in touch with anywhere between low-cousin chromatids out of homologous chromosomes are known as Chiasmata (singular-Chiasma). At chiasma, cross-formed or X-designed structures is formed, where cracking and you will rejoining from several chromatids exists. That it results in mutual exchange from equal and you can corresponding places anywhere between them.
Answer: Carica papaya, 2n=thirty six (Papaya) have 17 sets out of autosomes and one pair of sex chromosomes
- Single-cross over: Development away from single chiasma and you may comes to only a couple chromatids of five.
- Twice cross over: Formation away from one or two chiasmata and you will relates to 2 or three otherwise the five strands.
- Multiple go over: Formation in excess of a couple of chiasmata and you may crossing over frequency are very lowest. Continue reading Explain the sex determination mechanism in Carica papaya