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Allisa [31]
3 years ago
15

1. Your unique genetic identity comes from three different events; crossing over, random alignment, and random fertilization. Ex

plain what each of these are and how they lead to genetic diversity.
Biology
1 answer:
svetlana [45]3 years ago
5 0

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:

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Explanation:

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What fossil is a copy of an organism's structure, formed when minerals seep into a mold in sediment?
eimsori [14]
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Explain how goal of today’s classification system differs from earlier systems
gladu [14]

Classification systems previously were having very different goals than modern classification systems. If we look at old eras, scientists like Aristotle  and Theophrastus  tried to classify organisms on the basis of apparent characteristics, habitat and simple other traits.

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Goal of modern classification system:

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Thus modern goal is better in many terms and is more reliable than old classification goals.


Hope it helps!

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3 years ago
Refer to the following food chain: A fly eats a piece of fruit; a spider eats the fly; a bird eats the spider. The bird dies, an
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Hope it helped,

BioTeacher101

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