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.
Answer: Yes
Explanation: The molecular clock is figurative term for a technique<u> that uses the mutation rate of biomolecules to deduce the time in prehistory with two or more life forms.</u>
Gravitropism is the answer
Answer:
This question is asking to fill the blank spaces. The answers are:
1. Capsid
2. Cell content
Explanation:
A virus is an organism that is incapable of reproducing itself without invading an host cell. It is generally made up of a genetic material (DNA or RNA), and a protein coat called capsid. This CAPSID is the part of the virus that protects its genetic material and content.
This function of capsids is similar to that of the cell membrane in prokaryotic and eukaryotic cells as they both function to protect the cellular content including the genetic material.
Answer:
7 days.
Explanation:
In 7 days the moon will be in its last quarter phase. In the last quarter phase, the half part of the moon is illuminated and the other half is hide in darkness. The illumination of the sides of the moon provide information about the dates of the month. Last quarter phase is also called third phase of the moon. In this phase, the Moon is in quadrature and has the elongation of 270 degree. It is also the indication that the half cycle of the moon is completed and the other half is started.