Question

A somatic cell of a cat has the genetic equivalent of 40 chromosomes. After the S phase has taken place, how much genetic material will be present (in terms of the genetic equivalent of chromosomes)?

Answer 1

The s phase is after the G1 and before the G2

Answer 2

I think I know the answer hold on and im going to look in my notes ok

Answer 3

okay... but is it asking about the number of chromosomes?

Answer 4

@Frostbite

Answer 5

@abb0t

Answer 6

im going to guess 80 chromosomes since during that phase everything is doubled so... I could be wrong

Answer 7

okay but i was also wondering if the M phase takes place after, or before the S phase

Answer 8

the M phase is after G2 phase

Answer 9

in s phase chromatids are replicated, so you get the chromatid and it's sister chromatid, forming a chromosome.

Answer 10

did that help?

Answer 11

sort of but not completely

Answer 12

oh ok just send me a message if u need anything else

Answer 13

but why is the 40 doubled if the m phase did not happen yet

Answer 14

hold I gotta think...

Answer 15

can u give me more info on the question

Answer 16

because during the S-phase, the genetic material is copied and checked for errors.

Answer 17

i got the answer. it is 40.
"The ensuing S phase starts when DNA replication commences; when it is complete, all of the chromosomes have been replicated, i.e., each chromosome has two (sister) chromatids. Thus, during this phase, the amount of DNA in the cell has effectively doubled, though the ploidy of the cell remains the same. During this phase, synthesis is completed as quickly as possible due to the exposed base pairs being sensitive to external factors such as any drugs taken or any mutagens (such as nicotine)."

Answer 18

oh ok

Answer 19

Ploidy is the number of sets of chromosomes in the nucleus of a biological cell.

Answer 20

40 is right, right?