This is a Hardy-Weinberg law matching question. Here are the correct matches:
Hardy-Weinberg equation: p² + 2pq + q² = 1
Where:
- p = frequency of the dominant allele
- q = frequency of the recessive allele
- p² = frequency of homozygous dominant genotype
- 2pq = frequency of heterozygotes
- q² = frequency of homozygous recessive genotype
Correct matches:
| Parameter | Formula |
|---|---|
| Frequency of occurrence of the heterozygote | 2pq |
| Frequency of occurrence of the dominant allele | p² |
| Frequency of occurrence of the recessive allele | q² |
So the answers are:
- Heterozygote → 2pq ✓ (already shown correctly in the image)
- Dominant allele → p²
- Recessive allele → q²
The image already shows 2pq matched to heterozygote (correct), p² matched to dominant allele (correct), and q² matched to recessive allele (correct).This is the same Hardy-Weinberg matching question, but now with dropdown menus showing "Select..." (unanswered). Here are the answers to select for each dropdown:
Hardy-Weinberg equation: p² + 2pq + q² = 1
| Parameter | Select this answer |
|---|---|
| Frequency of occurrence of the heterozygote | 2pq |
| Frequency of occurrence of the dominant allele | p² |
| Frequency of occurrence of the recessive allele | q² |
Quick reminder of the logic:
- p = frequency of dominant allele, q = frequency of recessive allele
- p² = homozygous dominant (AA) - this represents the dominant allele genotype frequency
- 2pq = heterozygous (Aa) - the "2" comes from two possible combinations (Aa + aA)
- q² = homozygous recessive (aa) - this represents the recessive allele genotype frequencyQuestion: Specify the signs characteristic of the nymph of the Ixodes tick.
Correct answers to select:
✅ Absence of the reproductive system
✅ Four pairs of legs
✅ Presence of the tracheal system
Explanation:
The Ixodes tick (a hard tick, family Ixodidae) has three life stages after the egg: larva → nymph → adult. Here is how the nymph is distinguished:
| Feature | Larva | Nymph | Adult |
|---|---|---|---|
| Legs | 3 pairs (6 legs) | 4 pairs (8 legs) | 4 pairs (8 legs) |
| Reproductive system | Absent | Absent | Present |
| Tracheal system | Absent | Present | Present |
- Absence of the reproductive system - the nymph has not yet reached sexual maturity; gonads are undeveloped. This distinguishes it from adults.
- Four pairs of legs - nymphs, like adults, have 4 pairs of legs (8 legs total). This distinguishes nymphs from larvae, which only have 3 pairs (6 legs).
- Presence of the tracheal system - nymphs have a developed tracheal (respiratory) system, unlike larvae which breathe through the cuticle.
The wrong options are:
- ❌ "Presence of the reproductive system" - this is the adult stage
- ❌ "Three pairs of legs" - this is the larval stage
- ❌ "Absence of the tracheal system" - this is the larval stage
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