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Crazy boy [7]
3 years ago
5

What is the main difference between a cell nucleus and a nucleoid?

Biology
2 answers:
Ivanshal [37]3 years ago
8 0
A. the presence or absence of a surrounding membrane
laila [671]3 years ago
7 0

Answer:

the correct answer is A

Explanation:

your mom told me when i banged her lol

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Since 1997, food allergies in children have increased by 50%. Why is this so?
Ipatiy [6.2K]
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What season does the southern hemisphere experience when it is tilted away from the sun?
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Don't listen to the other answer (if it's still there) the answer is C. Winter

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3 years ago
What causes genetic variation in a population
Gre4nikov [31]

Answer:

A lot of factors cause genetic variation in a population. The root of all genetic variation is mutations, which occur randomly.

A lot of genetic variation in fact results during meiosis, the process by which gametes (sex/reproductive cells) are formed. The 3 main ways are crossing over, independent assortment of chromosomes, and random fertilization. Crossing over occurs during Prophase I of meiosis, in which genetic material is exchanged between nonsister chromatids of homologous chromosomes. Independent assortment refers to the following: When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other.  Random fertilization is where any sperm can fertilize any egg cell. The many combinations of eggs and sperms mean variation.

Another source of genetic variation include gene flow. Gene flow is where populations have their members enter other populations (migration), influencing the gene pool of populations. This source is more controversial, however.

Random mating can also increase genetic variation.

8 0
3 years ago
I NEED HELP PLEASE !!!!!
liberstina [14]

Explanation:

It like check s it......

7 0
3 years ago
What are the two major types of animals
sergiy2304 [10]

Answer:

Vertebrates and invertebrates

herbivores and carnivores

idk pick one

Explanation:

4 0
3 years ago
Read 2 more answers
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