How is prophase ii different than prophase i? a. tetrads do not form in prophase ii. b. the nucleus does not go away during prophase ii. c. there are no chromosomes during prophase ii. d. all of the above.

A: Tetrads do not form in prophase II

Explanation:

Prophase I and prophase II are stages in meiosis which is the division of sex cells that results in the production of haploid gametes or daughter cells.

Meiosis involves two successive division. At the end of the first division, two daughter cells are produced while each of the produced daughter cells undergo another division each to give four daughter cells at the end.

Meiosis I involves prophase I, metaphase I, anaphase I, and telophase I while meiosis II involves prophase II, metaphase II, anaphase II, and telophase II respectively.

Prophase I marks the beginning of meiosis and it involves a synapsis of homologous chromosomes to form a 4-chromatids structure known as bivalents or tetrads. On the other hand, prophase II does not involve formation of tetrads, rather, it involves the dissolution of nuclear envelope and formation of spindle. The chromosomes at this stage are not in 4-chromatids but 2 chromatids each.

The correction option is A.

the concept of nucleosome occupancy, which reflects the fraction of cells from the population in which a given region of dna is occupied by a histone octamer

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.