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olga55 [171]
3 years ago
9

Which of the following does NOT need to happen during a successful mitotic cell division?A)Single-chromatid chromosomes must be

segregated in full sets of the genome.B)of DNA between homologous chromosomes must happen before metaphase.C)The chromatin must condense fully so that the chromosomes are compact.D)Microtubules must be assembled as part of the spindle apparatus.E)Each of the chromosomes must start mitosis containing two DNA molecules
Biology
1 answer:
brilliants [131]3 years ago
4 0

The correct answer is: B)of DNA between homologous chromosomes must happen before metaphase

Mitosis is a process of somatic cell division, whereby a single cell divides into two daughter cells that are genetically identical. There are five stages of mitosis:

1. Interphase- The cell grows and prepares for the division.DNA duplicates, two copies of chromosomes are formed

2. Prophase- duplicated chromosomes condense- become compacted and tightly wound. Mitotic spindle which  organize the chromosomes is formed. Chromosomes attach to microtubules.

3. Metaphase-Chromosomes are lined up along the equator of the elongated cell (metaphase plate is formed).

4. Anaphase- the sister chromatids are moving to opposite ends of the elongated cell.  

5. Telophase- chromatids are on the opposite ends and cell division is almost over.

The phase after these is cytokinesis where the cell's cytoplasm divides.

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A cross between individuals that are heter0zyg0us for two different traits is a dihybrid cross. <em>A cross between two individuals that are heterozygous for eye and skin color would be an example of a _</em>dihybrid<em>_ cross.</em>

----------------------

Dihybrid crosses involve individuals that expresses two different traits and are heter0zyg0us for each of them.

So let us imagine we are studing the characters eye color and skin color. Let us assume that both of them are coded by single diallelic genes.

For eye color there is

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So, an individual that is heter0zyg0us for both of them, is BbAa.

If this person crosses to another person with the same genotype, we are talking about a <u>dihybrid cross</u>, because two dibybrid individuals are involved.

                             Cross:    BbAa      x      BbAa

According to this information, we can aswer the question:

<em>When crossing two individuals that are heterozygous for eye and skin color we are referring to a</em><em> dihybrid cross.</em>

-----------------------------------

Learn more about dihybrid crosses at

brainly.com/question/1185199?referrer=searchResults

brainly.com/question/24076691?referrer=searchResults

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