How can I distinguish between the three stages of Interphase (G1, S, and G2)?

1 answer:

7 0

(G1) - The stage where the cell spends most of it's life. Doing it's job (job being what the cell was created for, such as being a muscle or bone cell.) and being alive.

(S) - S phase is where cell performs synthesis (Hence the name of the stage, S.) and duplicates it's nutrients and everything inside it, most importantly though you must know that this is the stage where DNA is copied.

(G2) - This is the stage where the cell is preparing to entire mitosis, it's also known as the pre-mitotic phase. This phase takes place immediately after DNA has been replicated in the S phase. After the G2 phase is finished, mitosis begins.

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If the parent genotypes are Aa and Aa, the offspring are expected to be _____. 1/2 AA and 1/2 aa all Aa 1/4 AA, 1/2 Aa, 1/4 aa 3

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Punnet squares are your friend with these kinds of questions :)

 A | a |
A | AA | Aa |
a | Aa | aa |

Now we can easily see that 1/4 of the offspring will be AA, 1/2 will be Aa, and 1/4 will be aa. Therefore, it is the third answer that's correct (1/4 AA, 1/2 Aa, 1/4 aa). Hope this helps! :)

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3 years ago

PLEASE ANSWER ASAP!!!!!!

larisa86 [58]

Answer:

Since all cells in our body contain DNA, there are lots of places for mutation to occur; however, some mutations cannot be passed on to the offspring and do not matter for evolution.

Explanation:

I hope this answers your question...

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3 years ago

Why is it important that cell growth in a multi- cellular organism be regulated so carefully?

xxTIMURxx [149]

Answer:

It is important that cell growth in a multi-cellular organism be regulated carefully so as to maintain the integrity of the cell cycle

Explanation: Each cell in a multi-cellular organism has it cycle which consist of the inter-phase and the m-phase (active division). Cell growth takes place in the G1 phase of the inter-phase and this ensures that deoxy ribonucleic acid is synthesized in the S-phase in preparation for division.

Hence, adequate cell volume is a key event in order for division to take place. If cell growth is not regulated, it might result in a cell exiting the cell cycle into the resting phase in case of slow growth or result in over-division of a cell in case of over-stimulated growth. The latter is often the case in the development of cancerous cells.

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