rana pipiens, a species of frog, has a diploid chromosome number of 26.
a. how many chromosomes are present during metaphase i? per cell?
b. how many chromatids are present during anaphase i ? per cell?
c. how many centromeres are present during telophase I? per cell?
d. how many chromosomes are present during metaphase II? per cell?
pls help me! i was absent when our teacher discussed this lesson and she didn't give me any consideration..:(((
this will be passed tomorrow.
I searched Google under the key words "meiosis stages" to get these possible sources:
http://www.google.com/search?client=safari&rls=en&q=meiosis+stages&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
Sure, I'd be happy to help you understand this topic! Let's go through each question step by step.
a. How many chromosomes are present during metaphase I? per cell?
During metaphase I of meiosis, the homologous pairs of chromosomes line up at the equator of the cell. Each pair consists of two chromatids. Since Rana pipiens has a diploid chromosome number of 26, it means it has 26 pairs of chromosomes or 52 chromatids. Therefore, during metaphase I, there would be 52 chromatids per cell.
b. How many chromatids are present during anaphase I? per cell?
During anaphase I, the homologous pairs are pulled apart, resulting in the separation of the chromatids. Each chromatid moves towards one of the poles of the cell. Since each pair of homologous chromosomes consists of two chromatids, during anaphase I, there would be 52 chromatids per cell.
c. How many centromeres are present during telophase I? per cell?
During telophase I, the nuclear membrane reforms around the separated chromosomes, and the cell starts to divide. Each chromatid joins together with its homologous chromatid to form a new cell. Since each chromatid has one centromere, during telophase I, there would be 52 centromeres per cell.
d. How many chromosomes are present during metaphase II? per cell?
During metaphase II of meiosis, the sister chromatids from each chromosome line up individually at the equator of the cell. This is because the homologous chromosomes were already separated during anaphase I. Therefore, since Rana pipiens has a diploid chromosome number of 26, during metaphase II, there would be 26 chromosomes per cell.
I hope this helps you understand! If you have any more questions, feel free to ask. Good luck with your assignment!