Answer:
1. Chromatin condense into chromosomes.
4. Homologous chromosomes pair up (formation of tetrads).
5. Homologous chromosomes separate and move to poles.
2. Sister chromatids separate.
3. Chromosomes unravel in to chromatin.
Explanation:
This question portrays the process of meiosis in a cell. The ordered sequence of events in the options are:
1. Chromatin condense into chromosomes - This process occurs in the Prophase stage. Prior to the cell division, the nuclear material is found as Chromatin material. This Chromatin material then undergoes condensation to form visible chromosomes.
4. Homologous chromosomes pair up (formation of tetrads) - This process also occurs during the Prophase stage of meiosis I. In this stage, homologous chromosomes (similar but non-identical chromosomes received from each parent) are paired up side by side to form a structure known as TETRAD or BIVALENT.
5. Homologous chromosomes separate and move to poles - This process characterizes the Anaphase stage of meiosis I. Homologous chromosomes are pulled apart to opposite poles of the cell by spindle microtubules.
2. Sister chromatids separate - After meiosis I, meiosis II involving sister chromatids instead of homologous chromosomes follows. In the Anaphase stage of meiosis II specifically, sister chromatids are pulled apart towards opposite poles of the cell.
3. Chromosomes unravel in to chromatin - After the whole division process i.e. karyokinesis (division of the nuclear material), the chromosomes begin to unravel to form the CHROMATIN threads once again. This process occurs in the Telophase stage of meiosis.
Crude density and ecological density are both related but different. Ecological density is the portion of land that a certain species can colonize, where as crude density is the land within the organism's range.
1. The answer is (d.) algae
In a primitive type of community, algae is most likely to be found than deer, trees, and shrubs. In anthropology, primitive culture is referring to a society or a community to lack cultural, technological, or economic sophistication.
2. The answer is (b.) a natural recovery process
Ecological succession is the process of change within an ecological community.Succession occurs because organisms gradually change the environment.
Answer:
The continents were once connected, and marsupials were able to migrate over the land.
Explanation:
There are a lot of evidences present which indicates that the continent were once connected and present as a super continent but with the passage of time, this super continent splits into two parts and go far from each other. Marsupials also present on two different continents such as America and Australia. These two continents first attached to one another and these Marsupials spreads on these lands. With the passage of time, they splits and go far from one another.
