<h2>Answer:</h2>
If the crossover results in the pair of the chromosome, in which one contains no mutant allele while others contain two mutant alleles.
<h3>Explanation:</h3>
- The crossing over is the genetic random recombination phenomenon in the meiosis.
- In meiosis two homologous chromosomes randomly exchange their genetic material.
- This genetic exchange can be that much random that any part of one chromosome which is near to other can be exchanged leading to lethal and beneficial mutations.
- In crossing over if one chromosome gets the mutant part of the second chromosome while other chromosome gets the normal genetic material in return. This leads to one normal chromosome and the second chromosome having two mutant alleles.
Answer:
<h3>tham khảo tệp đính kèm ở trên</h3>
Answer:
E) Either anaphase I or II
Explanation:
Failure of segregation of homologous chromosomes during anaphase I or failure of segregation of sister chromatids during anaphase II leads to the presence of the abnormal number of chromosomes in resultant gametes. In the given example, the egg mother cell with 48 chromosomes (24 pairs) would enter meiosis I but the failure of one pair of homologous chromosomes to segregate from each other followed by normal meiosis II would result in the formation of two gametes with one extra chromosome and two gametes with one less chromosome.
On the other hand, if the nondisjunction occurs at anaphase II of meiosis II, two normal gametes, one gamete with one extra chromosome and one gamete with one less chromosome will be formed. Therefore, nondisjunction at anaphase I or anaphase II would have resulted in the production of eggs with one extra chromosome.
When you inhale muscles increase the size of your chest and in process your lungs expand. The increase of volume decreases the pressure in the lungs thus air rushes in.
