3. what two structures make up a single replicated chromosome?
4. in model 1, how many replicated chromosomes does the cell contain during prophase?
read this!
alleles are alternative forms of the same gene. for example, gene a may contain the information for fur color. one allele \a\ may result in white fur, while the alternative allele \a\ may result in black fur.
homologous chromosomes are chromosomes that contain the same genes, although each chromosome in the homologous pair may have different alleles.
5. at which stage in meiosis i do the pairs of homologous chromosomes come together?
6. once the chromosomes have formed a pair, what are they called?
7. at the end of meiosis i, two cells have been produced. how many replicated chromosomes are in each of these cells?
8. cells with a full set of chromosomes are referred to as diploid or 2n, whereas cells with half the chromosomes are haploid or n. at which stage(s) of meiosis i are the cells diploid and at which stage(s) are they haploid?
9. which of the statements below correctly describes the relationship between the cells at the end of telophase i and the original cell?
a. the new cells have one copy of all of the genetic information in the original cell.
b. the new cells have two copies of all of the genetic information in the original cell.
c. the new cells have one copy of half of the genetic information in the original cell.
d. the new cells have two copies of half of the genetic information in the original cell.
10. considering the genetic makeup of the homologous pairs, will the cells at the end of telophase i be genetically identical to each other?

Question

3. what two structures make up a single replicated chromosome?
4. in model 1, how many replicated chromosomes does the cell contain during prophase?
read this!
alleles are alternative forms of the same gene. for example, gene a may contain the information for fur color. one allele \a\ may result in white fur, while the alternative allele \a\ may result in black fur.
homologous chromosomes are chromosomes that contain the same genes, although each chromosome in the homologous pair may have different alleles.
5. at which stage in meiosis i do the pairs of homologous chromosomes come together?
6. once the chromosomes have formed a pair, what are they called?
7. at the end of meiosis i, two cells have been produced. how many replicated chromosomes are in each of these cells?
8. cells with a full set of chromosomes are referred to as diploid or 2n, whereas cells with half the chromosomes are haploid or n. at which stage(s) of meiosis i are the cells diploid and at which stage(s) are they haploid?
9. which of the statements below correctly describes the relationship between the cells at the end of telophase i and the original cell?
  a. the new cells have one copy of all of the genetic information in the original cell.
  b. the new cells have two copies of all of the genetic information in the original cell.
  c. the new cells have one copy of half of the genetic information in the original cell.
  d. the new cells have two copies of half of the genetic information in the original cell.
10. considering the genetic makeup of the homologous pairs, will the cells at the end of telophase i be genetically identical to each other?

Accepted Answer

### Question 5
# Brief Explanations:
In meiosis I, homologous chromosomes pair up during prophase I. This pairing is called synapsis, and it occurs specifically in the early stages of prophase I (leptotene, zygotene stages of prophase I, with zygotene being when synapsis is prominent).
# Answer:
Prophase I (specifically during synapsis in prophase I)

### Question 6
# Brief Explanations:
When homologous chromosomes form a pair during meiosis, this paired structure is called a tetrad (or a bivalent). A tetrad consists of two homologous chromosomes, each with two sister chromatids, so a total of four chromatids.
# Answer:
Tetrad (or bivalent)

### Question 7
# Brief Explanations:
At the end of meiosis I, the cell has undergone a reduction division in terms of chromosome number (homologous pairs are separated), but each chromosome is still replicated (has two sister chromatids). If the original cell (before meiosis I) had, for example, 4 replicated chromosomes (in a diploid cell with 2n = 4, replicated to 4 chromosomes each with two chromatids), after meiosis I (which separates homologous pairs), each resulting cell will have half the number of replicated chromosomes as the original cell before meiosis I. Typically, if the original cell (diploid, 2n) had 2n replicated chromosomes (each chromosome is replicated), after meiosis I, each cell has n replicated chromosomes. For example, in a human cell, before meiosis I, there are 46 replicated chromosomes (23 homologous pairs, each chromosome replicated). After meiosis I, each cell has 23 replicated chromosomes (each with two sister chromatids).
# Answer:
Half the number of replicated chromosomes as the cell had at the start of meiosis I (e.g., if the original cell had $ 2n $ replicated chromosomes, each cell has $ n $ replicated chromosomes)

### Question 8
# Brief Explanations:
- **Diploid (2n) stages in Meiosis I**: The cells are diploid during prophase I, metaphase I, and anaphase I. This is because the homologous chromosomes are still present in the cell (the cell has a full set of chromosomes, with each chromosome being replicated, but the cell has not yet completed the division that reduces the chromosome number to haploid). The cell is diploid until the end of telophase I and cytokinesis I, when the cell splits into two.
- **Haploid (n) stages in Meiosis I**: The cells become haploid at the end of telophase I (after cytokinesis I), because the homologous chromosomes have been separated into two different cells, so each cell now has only one set of chromosomes (even though each chromosome is still replicated). So after telophase I and cytokinesis, the two resulting cells are haploid (n), as they have half the number of chromosome sets as the original diploid cell.
# Answer:
- Diploid (2n) during: Prophase I, Metaphase I, Anaphase I
- Haploid (n) during: After Telophase I (and cytokinesis I, when the cell splits into two haploid cells)

### Question 9
# Brief Explanations:
- **Option a**: Incorrect. The new cells do not have one copy of all genetic info. Each chromosome in the new cells is still replicated (has two sister chromatids), so they have two copies of half the genetic information.
- **Option b**: Incorrect. The new cells do not have two copies of all genetic info. The homologous pairs have been separated, so they have half the number of chromosomes (half the genetic info in terms of chromosome number), but each chromosome is replicated (two copies of that half).
- **Option c**: Incorrect. The new cells have two copies (sister chromatids) of half the genetic information (since homologous pairs are separated), not one copy.
- **Option d**: Correct. The new cells (after telophase I) have two copies (because each chromosome is still replicated, with two sister chromatids) of half the genetic information (because homologous pairs have been separated, so they have half the number of chromosomes as the original cell). For example, if the original cell had 46 replicated chromosomes (23 pairs), the new cells have 23 replicated chromosomes (each with two chromatids), so two copies of half (23 out of 46) the genetic information.
# Answer:
d. The new cells have two copies of half of the genetic information in the original cell.

### Question 10
# Brief Explanations:
The cells at the end of telophase I will not be genetically identical to each other. This is because during prophase I, crossing over can occur (exchange of genetic material between homologous chromosomes), and also the assortment of homologous chromosomes during metaphase I and anaphase I is random. So the combination of alleles (and thus genetic makeup) in each of the two cells produced at the end of telophase I can be different. For example, if there are homologous pairs with different alleles, the random assortment of which homologous chromosome goes to which cell, along with possible crossing over, leads to genetic variation between the two cells.
# Answer:
No, the cells at the end of telophase I will not be genetically identical to each other.

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 5

Answer:

Question 6