Recall what you learned about the fate of homologous chromosomes during meiosis I and the sister chromatids during meiosis II, a

Question

zimovet [89]

3 years ago

11

Recall what you learned about the fate of homologous chromosomes during meiosis I and the sister chromatids during meiosis II, a

nd explain how trisomies like trisomy 21 or poly-X syndrome could occur

Biology

2 answers:

allochka39001 [22] · Answer 1 · 2022-04-26T17:37:26+03:00

Answer:

Please look in the explanation section

Explanation:

During meiosis I, pairing of homologous chromosomes occurs, resulting in the exchange of chromatids. Subsequently, homologous chromosomes separate between each other resulting in a decrease in the number of chromosomes. In meiosis II it occurs that the sister chromatids separate, each of the chromosomes formed by separating two different cells. Down syndrome occurs when in the process of abnormal cell division it helps with added genetic material on chromosome 21. On the other hand, poly x syndrome is a genetic disorder that occurs in women, leading to the formation of three X chromosomes. instead of two only two chromosomes.

tamaranim1 [39] · Answer 2 · 2022-04-26T15:24:02+03:00

tamaranim1 [39]3 years ago

3 0

Answer:

Both aneuploidies and trisomies are the result of nondisjunction of the homologous chromosomes during meiosis. The error in the mechanism of chromosome segregation produces two daughter cells, one of them with two homologous chromosomes and the other one without