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Brrunno [24]
3 years ago
5

Which processes lead to most genetic variation in sexually reproducing organisms? select all that apply. select all that apply.

crossing over cytokinesis independent assortment of chromosomes in meiosis random fertilization?
Biology
2 answers:
Law Incorporation [45]3 years ago
8 0
The answers are crossing over, independent assortment of chromosomes in meiosis and random fertilisation. Crossing over, especially, causes genetic recombination and results to traits that are different from either parents.
Another process that leads to genetic variations is genetic mutations.
Morgarella [4.7K]3 years ago
3 0

The processes that lead to most genetic variation in sexually reproducing organisms are the following;

-          Crossing over – the process of exchanging genetic material that occurs during sexual reproduction

-          Independent assortment of chromosomes in meiosis – the process where maternal chromosomes are not separated in a cell with the parental chromosomes separated

-          Random fertilization – responsible for the sperm and the egg to meet

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A fish maintains its depth in fresh water by adjusting the air content of porous bone or air sacs to make its average density th
Volgvan

Answer:

0.153

Explanation:

We know the up-thrust on the fish, U = weight of water displaced = weight of fish + weight of air in air sacs.

So ρVg = ρ'V'g + ρ'V"g where ρ = density of water = 1 g/cm³, V = volume of water displaced, g = acceleration due to gravity, ρ'= density of fish = 1.18 g/cm³, V' = initial volume of fish, ρ"= density of air = 0.0012 g/cm³ and V" = volume of expanded air sac.

ρVg = ρ'V'g + ρ"V"g

ρV = ρ'V'g + ρ"V"

Its new body volume = volume of water displaced, V = V' + V"

ρ(V' + V") = ρ'V' + ρ"V"

ρV' + ρV" = ρ'V' + ρ"V"

ρV' - ρ"V'  = ρ'V" - ρV"

(ρ - ρ")V'  = (ρ' - ρ)V"

V'/V" = (ρ - ρ")/(ρ' - ρ)

= (1 g/cm³ - 0.0012 g/cm³)/(1.18 g/cm³ - 1 g/cm³)

= (0.9988 g/cm³ ÷ 0.18 g/cm³)

V'/V" = 5.55

Since V = V' + V"

V' = V - V"

(V - V")/V" = 5.55

V/V" - V"/V" = 5.55

V/V" - 1 = 5.55

V/V" = 5.55 + 1

V/V" = 6.55

V"/V = 1/6.55

V"/V = 0.153

So, the fish must inflate its air sacs to 0.153 of its expanded body volume

5 0
3 years ago
Which model shows more diversity? <br><br> A. Food chain<br> B. Food web
Rudiy27

Answer: A food web.

Explanation:

A food web has more diversity because a food chain only shows what each animal eats. A food web,however, shows everything you need to know and more.

5 0
3 years ago
Read 2 more answers
How does a decrease/decline in a top predator impact biodiversity in an ecosystem?
vivado [14]

Answer:

Results in biodiversity loss due to the proliferated growth of prey that feeds on smaller species

Please find the explanation below

Explanation:

In an ecosystem, organisms feed on one another to obtain energy. In this process organisms called CONSUMERS kill and feed on one another in a process called PREDATION. Top predators are those consumers that are found at the peak of the food chain.

A reduction in the number of top predators/tertiary consumers in an ecosystem means that the secondary consumers they feed on (prey) will grow and reproduce beyond control, hence, causing them to pose serious threat to the population of smaller species below them in the food chain.

Therefore, a decrease/decline in a top predator will impact biodiversity by causing it's loss, as organisms in lower level of the food chain will drastically diminish.

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