A normal human cell with 46 chromosomes undergoes meiosis. One tetrad fails to separate during anaphase I. The two pairs of chromosomes separate during anaphase II. Predict the number of chromosomes in each of the four sperm cells produced.(1 point) Responses One sperm cell has 26 chromosomes. One sperm cell has 20 chromosomes. Two sperm cells each have 22 chromosomes. One sperm cell has 26 chromosomes. One sperm cell has 20 chromosomes. Two sperm cells each have 22 chromosomes. One sperm cell has 25 chromosomes. Once sperm cell has 21 chromosomes. Two sperm cells each have 22 chromosomes. One sperm cell has 25 chromosomes. Once sperm cell has 21 chromosomes. Two sperm cells each have 22 chromosomes. Two sperm cells will each have 22 chromosomes. The other two sperm cells will each have 24 chromosomes. Two sperm cells will each have 22 chromosomes. The other two sperm cells will each have 24 chromosomes. Two sperm cells will each have 23 chromosomes. The other two sperm cells will each have 24 chromosomes. Two sperm cells will each have 23 chromosomes. The other two sperm cells will each have 24 chromosomes.
Two sperm cells will each have 23 chromosomes. The other two sperm cells will each have 24 chromosomes.
The correct answer is: Two sperm cells will each have 22 chromosomes. The other two sperm cells will each have 24 chromosomes.
To understand why this is the correct answer, let's break down the process of meiosis and analyze the given information:
1. A normal human cell with 46 chromosomes undergoes meiosis: Meiosis is a type of cell division that occurs in the reproductive cells (gametes) to produce sperm or eggs. In humans, normal body cells contain 46 chromosomes, which undergo two rounds of division during meiosis.
2. One tetrad fails to separate during anaphase I: During anaphase I of meiosis, pairs of homologous chromosomes (tetrads) normally separate and move to opposite poles of the cell. However, in this case, one of the tetrads did not separate, resulting in an error called nondisjunction.
3. The two pairs of chromosomes separate during anaphase II: Anaphase II is the second division of meiosis, where the sister chromatids of each chromosome separate and move to opposite poles of the cell. In this scenario, the two pairs of chromosomes successfully separate as expected.
Based on this information, we can determine the number of chromosomes in each of the four sperm cells produced:
- Two sperm cells will each have 22 chromosomes: These two sperm cells result from the pair of chromosomes that successfully separated during anaphase II. Since the tetrad failed to separate during anaphase I, these sperm cells will have one extra chromosome, resulting in a total of 22 chromosomes.
- The other two sperm cells will each have 24 chromosomes: These two sperm cells result from the failure of tetrad separation during anaphase I. As a result, they will contain the extra pair of chromosomes that failed to separate, totaling 24 chromosomes in each sperm cell.
Therefore, the correct answer is that two sperm cells will each have 22 chromosomes, while the other two sperm cells will each have 24 chromosomes.
The correct response is: One sperm cell has 26 chromosomes. One sperm cell has 20 chromosomes. Two sperm cells each have 22 chromosomes.
During meiosis, a normal human cell with 46 chromosomes undergoes two rounds of division. In the first division (meiosis I), homologous chromosomes pair up and then separate, reducing the chromosome number by half. In this case, one tetrad (a pair of homologous chromosomes joined together) fails to separate during anaphase I, resulting in an unequal distribution of chromosomes.
In the second division (meiosis II), the sister chromatids of each chromosome separate, resulting in four haploid cells (gametes). Since the two pairs of chromosomes eventually separate during anaphase II, the resulting sperm cells will have different chromosome combinations.
Therefore, one sperm cell will have the correct number of chromosomes (26 chromosomes), representing the normal haploid number of chromosomes in a human cell. Another sperm cell will have one less chromosome than normal (20 chromosomes) due to the failure of one tetrad separation. The remaining two sperm cells will have a total of two extra chromosomes (22 chromosomes each) since they will receive both chromosomes from the pairs that separated during anaphase II.