Question

Mapping with haploid eukaryotes is different than with diploid eukaryotes because in many cases all the products of a single melotic division can be examined together. As an example of this, in many types of fungi the spores produced by single meiotic event are kept together in a sac called an ascus. In the following problem you will be examining meiosis in haploid fungus

Answer 1

Ascospores are formed in the sac like structure called ascus

* single celled ascospore is formed.

* The nuclear fusion occurs in cell ( diploid cell )

* Immediately after fusion diploid cell undergo meiosis and forms 4 haploid nucleii

* Mitosis occurs in these cells and forms 8 ascospores.

The haploid spores are seen in fungus. These spores are germinate to new fungus by forming the germ tube , as a result of sexuall reproduction spores are formed.

Steps:

1. Nuclear fusion

2. Meiosis

3. Mitosis

In the formation of Blastospores meiosis take palce.

These are the single celled spores borne on the club shaped strutcure called basidium.

* Nuclear fusion and meiosis take place in basidium

* Nuclear migration take place.

* Basidium formed exogenously at the tip of special out growth called sterigmata.Usually four spore are formed ( haploid ).

Steps:

1. Nuclear fusion

2. Meiosis

3. Nuclear migration.

Parts: sterigmata, basidium, basidiospore

Mainly the haploid cells formed as a result of sexuall reproduction.