Answer:
Random segregation of homologous chromosomes makes the two siblings differ from each other for 0-23 chromosomes.
Explanation:
Sexual reproduction adds genetic variations in the progeny by crossing over, independent segregation of homologous chromosomes and random fusion of gametes. Without crossing over, independent segregation of homologous chromosomes towards opposite poles during anaphase I of meiosis may result in two siblings to vary from each other for 0-23 chromosomes.
There is an equal probability of each of the two siblings to get a chromosome from mother or father. Hence, irrespective of the variations provided by crossing over, random segregation of homologous chromosomes makes the two siblings differ from each other for 0-23 chromosomes.
<u>Answer:</u>
Effects Include:
Activates secondary messengers such as cAMP which further activates number of hormones like
- ADH: production of this hormone causes kidneys to retain more water inside body.
- GHRH: release growth factors and stimulates growth of organism.
- ACTH: produces fight or flight responses i.e rise in heart beat, rise in Blood pressure etc
- TSH: Stimulate the synthesis of Thyroid hormone and enhances the metabolism of body. In rare cases causes Goiter without the deficiency of Iodine.
- LH: Stimulate follicle maturation and formation of ovules in women.
- Calcitonin: Decreases blood calcium level by deposition calcium in bones. This effect weakens the muscles.
- Glucagon: Stimulates glycogen breakdown from liver and muscles and many more effects.
<u>Explanation:</u>
Background Knowledge:
GPCR (G Protien coupled receptors) are present inside plasma membrane in huge amount. As name suggest that these receptors are coupled with G proteins during their inactive state present inside of the cell. During their Inactive state these G proteins are bounded with GDP molecule.
Upon receiving signal molecules from outside of cell alters the shape of GPCR. These receptors also triggers change in G Protein, as a result of this GTP get attached with them. This protein further activates reaction cascades inside of the cell.
What happen if GTP cannot be hydrolyzed to GDP + Pi?
If GTP cannot hydrolyzed in to GDP + Pi than, it cannot be able to dissociate from G proteins. Cascade system doesn't stop and produces many effects on body.
Effects Include:
Activates secondary messengers such as cAMP which further activates number of hormones like
- ADH: production of this hormone causes kidneys to retain more water inside body.
- GHRH: release growth factors and stimulates growth of organism.
- ACTH: produces fight or flight responses i.e rise in heart beat, rise in Blood pressure etc
- TSH: Stimulate the synthesis of Thyroid hormone and enhances the metabolism of body. In rare cases causes Goiter without the deficiency of Iodine.
- LH: Stimulate follicle maturation and formation of ovules in women.
- Calcitonin: Decreases blood calcium level by deposition calcium in bones. This effect weakens the muscles.
- Glucagon: Stimulates glycogen breakdown from liver and muscles and many more effects.
I'm pretty sure it's primary growth. I might not have studied this type of biology yet, but secondary growth would definitely not be the answer.<span />
