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Nastasia [14]
3 years ago
5

During the cell cycle, what occurs to the cell at the interphase stage?

Biology
2 answers:
sladkih [1.3K]3 years ago
6 0
Inter phase consists of G1, S, when DNA is replicated, and G2. Interphase ends and mitosis begins
Aleks04 [339]3 years ago
3 0

Answer:

Cell prepares for division

Explanation:

Prior to cell division, the cell prepares itself for the process. The phase where the cell does this is called INTERPHASE. Interphase is the longest phase of the cell cycle that occurs between two successive divisions. It encompasses three stages viz: G1 phase, S-phase and G2 phase.

In the G1 phase, the cell grows larger. It also accumulates building blocks of its molecular unit (DNA).

In the S-phase, also called the Synthesis phase, the cell replicates its DNA in the nucleus. This increases the DNA content of the cell in order for each daughter cell produced during the actual cell division to receive a correct number of DNA content. The spindle-producing centrosome is also duplicated at this stage.

In the G2 phase, the cell reorganizes its content, makes copies of its organnelles and prepares generally for division

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Barred feather pattern is a Z-linked dominant trait in chickens. What offspring would you expect from (a) the cross of a barred
Bezzdna [24]

Answer:

Let the "barred" allele be caller B and the "non-white" allele b. Since chickens use chromosomes Z  and W to determine sex, hens would have chromosomes ZW, and roosters would have chromosomes ZZ. A Z-linked gene is represented as a superscript on the Z chromosome, Z^{B} for the dominant allele and Z^{b} for the ressesive allele.

A barred hen would have a copy of B on its Z chromosome, a non-barred rooster would have both copies of b on both Z chromosomes. Using Punnet squares to represent the crosses we get the following cases:

\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{B} & W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \ Z^{b} & Z^{B}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}

That is a ratio of two barred heterozygote roosters to two non-barred hens. Crossing them we get:

\begin{center}\begin{tabular}{ |c|c|c|c| }\ & Z^{b} & W \\ \ Z^{B} & Z^{B}Z^{b} & Z^{B}W \\ \ Z^{b} & Z^{b}Z^{b} & Z^{b}W \\ \end{tabular}\end{center}

That is a ratio of one barred heterozygote rooster to one barred hen to one non-barred rooster to one non barred hen.

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3 years ago
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