In this article we will discuss about the structure of chlamydomonas (explained with labelled diagram). The unicellular green alga Chlamydomonas is haploid with a single nucleus, a chloroplast and several mitochondria (Fig. 9.3). It can reproduce asexually as well as sexually by fusion of gametes of opposite mating types (mt+ and mt-). The mating type is controlled by a single [...]
Sonneborn in 1938 discovered certain strains in Paramecium which showed a killer trait due to the presence of a cytoplasmic factor called kappa. The killer strain can destroy the sensitive strains growing in culture which do not have kappa by liberating a toxic substance paramecin. Killer strains are not killed by their own paramecin. Paramecium has two kinds of nuclei, [...]
Get the answer of: How Many Stages are in Mitosis ? 1. Prophase: The DNA in the diffuse chromatin of the resting nucleus in interphase has been duplicated in S phase preceding this cell division. The extended state of interphase chromatin allows transcription and replication of DNA, but is not suitable for division into two daughter cells. Therefore, prophase, the [...]