Question

Out of 8 ascospores formed in Neurospora , the arrangement is 2a: 4a: 2a showing

A. No crossing over

B. Some meiosis

C. Second generation division

D. First generation division

Answer 1

Life on earth appeared a million years ago and the earth is a home of many species of living beings. These living things are found in different habitats; air, water, Land, forest, desert, mountains etc. They show intra as well as interspecific ecological conflicts as well as cooperative interactions.

Complete answer:

Neurospora is a genus of Ascomycota phylum of kingdom fungi. The genus name, meaning "nerve spore" refers to the characteristic striations on the spores that resemble axons.

In Neurospora after crossing over between the gene and centromere, the paired arrangement of ascospores is AA aaaa AA or 2a: 4a: 2a. This is called second division segregation.

So, the correct answer is 'Second generation division'.

Additional information:

On the basis of the characters living things are divided into different biological groups called taxa and the process or study of classification is known as taxonomy.

The living beings have some characteristics like;

Change in shape and size

Growth

Reproduction

Metabolism

Cellular organization

Consciousness

Definite life cycle

Genetic material

Adaptation

The living organisms are classified under following five kingdom classification systems;

1. Kingdom Monera

2. Kingdom Protista

3. Kingdom fungi

4. Kingdom Plantae

5. Kingdom Animalia

Note:

Taxonomy is also defined as the study of the classification of plants and animals and their evolutionary relationship.

The term taxonomy was termed by de Candolle.

R.H.Whittaker gave the five kingdom classification for the living organisms in 1969.