Answer:
Crossing over and random alignment are the events of meiosis-I that add new gene combinations to the gametes. Random fusion of male and female gametes is called random fertilization.
Explanation:
During the pachytene stage of meiosis-I, part of the chromatids of each of the homologous chromosomes of a bivalent is broken apart and exchanged. This exchange of the genetic material between the members of a bivalent is called crossing over. The recombinant chromatids formed by crossing over have new allele combinations that were otherwise not present in the parental chromatids.
During metaphase I, the homologous pairs are aligned at the cell's equator in a random manner. This means that either the paternal or maternal chromosome of a pair may face one or the other pole of the cell. The arrangement of chromosomes during metaphase-I determines whether the paternal or maternal chromosome of each pair would be distributed to one or the other pole of the cell. This random segregation creates new gene combinations in gametes.
All the gametes have equal chances of getting fused with a gamete from the opposite gender. This is called random fertilization and further adds variations.
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Answer: Option C. Recognize and cope with the daily demands of life.
Explanation:
Good mental health recognizes and copes with the daily demands of life. Mental health is a state of well-being in which an individual recognizes his or her own proficiency, can cope with the normal stresses of life, can work productively and is able to make a contribution to his or her community. Mental health is important to our collective and individual ability as humans to think, interact with each other, earn a living and enjoy life. Mental health promotion, protection, and restoration should be considered as an important concern for individuals, communities, and societies.
Bacteroid has a thick cell wall which is absent in a bacterial cell(its outer structure is made up of a cytoplasmic membrane).
Answer: Cut the stem and if the vascular bundles are scattered in the stem, it is a monocot.
Explanation:
The plant is whether monocot or dicot can be identified by the cross-section of the stem if leaves, flowers, fruits or seeds are not available.
In the cross-section of the monocot stem, the vascular bundles are scattered, without following a definite arrangement, whereas the dicot stem, will have the vascular bundles that have a definite shape, aligned in the form of rings.
In the case of monocot stem the bundle sheath is present whereas in case of dicot stem the bundle sheet is absent.