Question

question 8 1 pts an individual with down syndrome has three copies of chromosome 21. would all children of an individual with down syndrome also have down syndrome? no, only 75 percent of the eggs or sperm formed would have an extra copy of the chromosome. no, only 25 percent of the eggs or sperm formed would have an extra copy of the chromosome. yes, all children would also have three copies of chromosome 21. no, only 50 percent of the eggs or sperm formed would have an extra copy of the chromosome.

Explanation:

Individuals with Down - syndrome have a trisomy of chromosome 21. During meiosis, the three copies of chromosome 21 segregate randomly. On average, 50 percent of the eggs or sperm formed will have an extra copy of chromosome 21. So not all children of an individual with Down - syndrome will have the condition.

Answer:

No, only 50 percent of the eggs or sperm formed would have an extra copy of the chromosome.