examined 200 primary oocytes, in how many would you expect to see a chiasma between the two loci ?
To determine the expected number of primary oocytes that would exhibit a chiasma between the two loci, you would need some additional information. The formation of chiasmata during meiosis is a random event and can vary with different factors such as species, genetic factors, and environmental conditions. However, let's assume that the frequency of chiasmata formation is known and provided. In that case, you can follow the steps below to calculate the expected number:
1. Determine the frequency of chiasmata formation: This information should be given in the problem or available in relevant literature. For example, if the frequency is known to be 10%, it means that 10 out of 100 primary oocytes are expected to have a chiasma.
2. Calculate the expected number: Multiply the frequency of chiasmata formation by the total number of primary oocytes examined. If we assume the frequency to be 10% and the total number of primary oocytes examined is 200, the calculation would be:
Expected number = Frequency of chiasmata formation × Total number of primary oocytes examined.
Expected number = 0.10 × 200 = 20.
Therefore, you would expect to see a chiasma between the two loci in approximately 20 primary oocytes out of the 200 examined.