Its either B or D. That's about all i can do. sorry
Explanation:
Crossing over, or genetic recombination contributes to genetic variation and diversity.
In early Prophase I of meiosis, crossing over occurs. This is the exchange of segments of chromosome, between non-sister homologous or similar chromatids crossing over happens at chiasmata, the point where non-sister chromosomes are joined. The chromosome pairs form tetrads held together at chiasmata.
Further Explanation:
All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. To produce daughter cells, the chromosomes (total number of chromosomes (2n)) are copied before the cell splits into two daughter cells. This process is known as mitosis, and occurs in cell division and growth processes. Two new nuclei are formed, along with identical cells. These are the same as the parent cell and the chromosome number (2n) is maintained. Conversely in meiosis, the number of chromosomes (2n) is halved through meiotic divisions, producing 4 (n) germ cells (sperm or eggs), each containing half the number of chromosomes as its parent cell.
During the process of prophase I one the nuclear envelope containing chromosomes has only partly broken down homologous chromosomes are joined together by proteins and a complex or pairing call synapsis- corresponding genes on chromatids are aligned precisely. The syanpsis allows for crossing over which is the exchange of segments of chromosome, between non-sister homologous or similar chromatids crossing over happens at chiasmata, the point where non-sister chromosomes are joined.
Crossing over contributes to genetic variation and diversity; novel gene combinations in gametes are formed, which are not present in parent chromosomes. Genetic diversity describes all the genetic characteristics or traits within a species.
Learn more about mitosis at brainly.com/question/4303192
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Answer:
Deletion
Explanation:
Deletion is the act of a gene being removed from a chromosome, making it mutated.
Answer:
The components of abstracts that should be included are as follows: " introduction, Description, limitations, conclusion". Other than these components anything else should be excluded.
Explanation:
The various components of an scientific abstract that should be included are as follows:
Introduction: In this part of the abstract it should contain the brief idea about the research.
Description: In the second part it should contain the research and the objective of the research and also about the analytical methodologies that has been applied in the research.
Critical: This is part in which the limitation for the research are present.
Language: The most important factor, the language used should be very formal type.
Conclusion: The things and ideas that had been learnt during the period of research. It should also contain the new findings and the trends that has came out during the research.
