Using the data from the previous question (Q3), what is the map distance between chlorina and dwarf?
[ Select ]
68 map units
16 map units
32 map units
34 map units

Using the data from the previous question (Q3), what is the map distance between glabrous and dwarf?
[ Select ]
45 map units
5 map units
1 map unit
10 map units

Question

Using the data from the previous question (Q3), what is the map distance between chlorina and dwarf? 
[ Select ]
68 map units
16 map units
32 map units
34 map units

Using the data from the previous question (Q3), what is the map distance between glabrous and dwarf? 
[ Select ]
45 map units
5 map units
1 map unit
10 map units

BlackTom AI · Accepted Answer

We are asked to determine map distances in two separate pairwise comparisons using data from a previous question. Map distance in genetics is typically measured in map units (centiMorgans) and corresponds to recombination frequency between genes or markers.

First question options: 68 map units, 16 map units, 32 map units, 34 map units
- 68 map units: This would imply a very high recombination frequency (68%), which is possible in theory but unusual for a two-point test unless chromosomes are unusually extensive or there's a measurement error. In standard linkage analyses, such a high value is less common for a direct two-point mapping unless the markers are effectively unlinked.
- 16 map units: A small distance suggests tight linkage with low recombination. If the provided data indicate low recombination between chlorina and dwarf, this could be plausible, but we need to assess against the actual data pattern from Q3. Without that data, this remains a conceivable but uncertain option.
- 32 map units: This represents a moderate distance, typical of genes that are linked but not very tightly. It is a plausible value if recombination occurred at about one-third of the time.
- 34 map units: This is very close to 32, suggesting a moderate distance as well. The exact value depends on the observed recombination frequency in the data; without the raw counts, this remains a plausible moderate-distance option.
- In choosing among these, think about the typical increments in map distance and the likelihood of observing recombinants given two loci are linked. If the data show roughly one in three offspring recombinant for chlorina vs. dwarf, a value around 34 map units would be consistent; if recombinants are rarer, a smaller value like 16 map units might be favored. Since you’re selecting from discrete options, pick the one that best aligns with the observed recombination rate reported in Q3 data.

Second question options: 45 map units, 5 map units, 1 map unit, 10 map units
- 45 map units: This would indicate a high recombination frequency, suggesting looser linkage. In many two-point crosses, values around 40–50 map units are seen when loci are not tightly linked or are assorting independently. If the data show substantial recombination between glabrous and dwarf, this could be a candidate.
- 5 map units: A very tight linkage value, implying very low recombination. If the Q3 data indicate strong linkage between glabrous and dwarf, this small distance would be supported.
- 1 map unit: Extremely tight linkage, with almost no recombination observed. This is only plausible if the loci are almost perfectly linked in the population data; it’s less common but possible in tight clusters.
- 10 map units: A modest distance, indicating some recombination but not high. This is a reasonable middle-ground option when recombination is present but not extensive.
- As with the first pair, the correct choice hinges on the actual recombination counts from Q3. If the observed recombinants are very rare between glabrous and dwarf, a value like 1 or 5 map units would be more consistent; if recombination is more frequent, 10 or 45 map units could be appropriate.

Note: Since the exact counts or frequencies from Q3 are not provided here, the reasoning focuses on how each option would align with typical recombination patterns and how to interpret map distances. When you review Q3, match the reported recombination frequency to the closest map-unit value among the options for each pair.

AGRI10051_2025_SM2 Practical 4 Post-prac Test

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