Question

of the three types of life cycles which one occurs in humans? what does it means?

which type of cell in an organism is diploid?

during prophase1 of meiosis1, an exchange of segments of non-sister chromatids of homologous chromosomes occurs. what is that process called? what is the purpose of this process?

how is meiosis 2 similar to mitotic division? what are final products of meiosis?

Answer 1

Human have Diploid - dominant life cycle. the multicellular diploid stage is the most obvious life stage, and the only haploid cells are the gametes.

somatic cells in organism are Diploid. Somatic cells are present in all over body except Gamets. Somatic cells contain 2 sets of chromosome.

during prophase1 of meiosis1, an exchange of segments of non-sister chromatids of homologous chromosomes occurs. The name of precess is crossing over or recombination.

During recombination 2 chromosome from two parent cross with each other while chromosomal segment exchange and genetic information .

During this process genetic information of both parents exchange and cause variation in offspring.

In meiosis I haploid cells are formed from Diploid cell. From one Diploid cell 2 haploid cells formed. Haploid cell contain half or single set of chromosome.so it is called reductional cell division. In meiosis II from 2 haploid cell 4 haploid cells are formed. That means chromosome no.remain same I.e haploid. in Mitosis chromosome no. Of daughter cells and mother cell are same. During division no.remain same so it is called equational division. In meiosis II same process followed.

In meiosis , 4 daughter haploid cells formed from single Diploid mother cell.