Explanation:
Genetic variation in offspring during sexual reproduction is caused by
- crossing over
- independent assortment
- randomized fertilization
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 during cell division, 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.
- crossing over: 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.
- independent assortment in metaphase I of meiosis: chromosomes align independently and genes segregate independently into new combinations
- randomized fertilization: sperm cells fertilize an ovum to form a zygote. This occurs randomly by chance, to result in a complete set of chromosomes 2n, that is a novel combination of half each parent's number of chromosomes
Learn more about mitosis at brainly.com/question/4303192
Learn more about transcription at brainly.com/question/11339456
Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316
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Answer:
Option-B
Explanation:
The theory of endosymbiosis provided the evidence which suggested that the eukaryotic organelles like mitochondria and chloroplast evolved from the smaller prokaryotes which were once independent organisms.
These prokaryotes, when engulfed by larger cells, formed symbiotic relationship among themselves and later evolved into the organelle.
In the given question, since the zoochlorellae contains paramecium bursaria within its cytoplasm which could form the symbiotic relationship. This could act as an evidence of the endosymbiotic theory.
Thus, Option-B is the correct answer.
1. mitochondria
2.metabolism
3.respiration
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The nitrogenous bases guanine and adenine are called a. purines.
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Answer:
<em>It is type of phosphorylation in which ATP is directly formed by combing ADP with Pi.</em> <em>It occurs in Glycolysis and Kreb cycle. </em><em>1 3 BisPhosphoglycerate</em><em> is substrate in Glycolysis and </em><em>Succinyl CoA</em><em> acts as substratte in Kreb cycle.</em>