# Parental Care and Conflict

Psychology I · Ethology · https://tryals.app/learn/psychology-i/parental-care-and-conflict

## Investing in the Next Generation

**Parental care** is any behavior by a parent that raises offspring fitness, typically at a cost to the parent's ability to invest elsewhere. Its forms include **provisioning** (feeding), **protection**, and **thermoregulation**.

Investment is heavily shaped by **paternity certainty**. Males are less certain than females that offspring are genetically theirs under internal fertilization, which often correlates with lower male investment.

## Parent-Offspring Conflict

Robert Trivers' **Parent-Offspring Conflict** explains why parents and offspring disagree on resource allocation. Relatedness values $r$ drive this:

| Perspective | Relatedness to self | Relatedness to sibling |
| --- | --- | --- |
| The offspring | 1.0 | 0.5 |
| The parent | 0.5 | 0.5 |

Because an offspring values its own gain twice as much as a sibling's, it demands investment longer than the parent should provide.

> **Common pitfall:** Viewing this conflict as moral selfishness. Both sides maximize inclusive fitness; it is a mathematical result of relatedness asymmetry.

## Practice questions

6 of this lesson's 9 practice questions, with answers. The full set is in the app.

### 1. Parent-offspring conflict theory predicts weaning disputes even though both parties want the offspring to survive. Why does shared interest not prevent the conflict?

A. Because offspring behaviour is not yet under genetic control at weaning
B. Because it is related to itself by 1 and to a sibling by 1/2
C. Because the conflict is a byproduct of resource scarcity rather than of relatedness
D. Because the parent cannot recognise its own offspring reliably

**Answer:** B. Because it is related to itself by 1 and to a sibling by 1/2

**Why:** Trivers' insight is that partial genetic overlap gives partially overlapping interests. The parent is equally related to all its offspring; each offspring is not, so they disagree about when investment should stop.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/parent-offspring-conflict-theory-predicts-weaning-disputes-even

### 2. A weaning tantrum is usually read as a baby being difficult. Parent-offspring conflict theory says something is genuinely in dispute. What?

A. How the mother's remaining resources should be divided
B. Whether the mother has enough milk, which the infant cannot assess
C. Nothing real, the conflict is behavioural, not a difference of interest
D. Which of them is more closely related to the future sibling

**Answer:** A. How the mother's remaining resources should be divided

**Why:** The arithmetic disagrees before anyone does. Mother is indifferent between this infant and the next; the infant is not, weighting itself twice as heavily, so it wants milk for longer than she should give it. The tantrum is a negotiating position, and it is written into relatedness rather than temperament.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/a-weaning-tantrum-is-usually-read-as-a-baby-being-difficult

### 3. Select every statement that is TRUE about parent-offspring conflict.

A. From the mother's side, the pup at the teat and the unborn one are equal.
B. A parent is genetically unrelated to its future offspring.
C. The conflict proves the offspring is morally selfish.
D. An offspring values a benefit to itself twice as much as the same benefit to a future sibling.
E. The disagreement is written into the relatedness arithmetic, not into anyone's temperament.

**Answer:** A. From the mother's side, the pup at the teat and the unborn one are equal.; D. An offspring values a benefit to itself twice as much as the same benefit to a future sibling.; E. The disagreement is written into the relatedness arithmetic, not into anyone's temperament.

**Why:** Relatedness asymmetry, the offspring's 2:1 self-valuation, and the parent's equal valuation are all true. The conflict is not moral selfishness, and the parent IS related (r = 0.5) to future offspring - so those two are false.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/select-every-statement-that-is-true-about-parent-offspring-conflict

### 4. Match each observation to the concept or cause behind it.

**Answer:**

- A weaning-age mammal throws tantrums demanding more nursing → Parent-offspring conflict (offspring values self 2x)
- A male invests less in care when he cannot be sure offspring are his → Paternity certainty
- A parent sits on eggs to keep them at a viable temperature → Thermoregulation
- A parent carries food back to feed its nestlings → Provisioning

**Why:** Tantrums reflect parent-offspring conflict, reduced male care reflects paternity certainty, incubating is thermoregulation, and feeding is provisioning. Each observation maps to the concept that explains it.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/match-each-observation-to-the-concept-or-cause-behind-it

### 5. Order the logic of weaning conflict, from the parent's care to the observable clash.

**Answer:**

1. The parent begins providing care to its current offspring.
2. Continued investment increasingly costs the parent's future offspring.
3. The offspring (r = 1.0 to itself, 0.5 to a future sibling) still gains from more care.
4. The offspring demands more than the parent is selected to give.
5. The disagreement shows up as weaning conflict and tantrums.

**Why:** Care is given, its continuation costs future offspring, but the offspring still profits from more (valuing itself twice as much as a sibling), so it demands more than the parent will give - producing weaning conflict. The tantrum is the visible tip of a relatedness mismatch.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/order-the-logic-of-weaning-conflict-from-the-parents-care-to-the

### 6. Sort each parental behavior by the form of care it represents.

**Answer:**

- Provisioning: A bird brings worms to its chicks, A mammal nurses milk to its young
- Protection: A mother mobs a hawk to defend the nest
- Thermoregulation: A parent sits on the eggs to keep them warm

**Why:** Feeding (worms, milk) is provisioning, defending against predators/rivals is protection, and keeping young at a viable temperature (incubating, huddling) is thermoregulation. Each behavior is classified by the offspring need it meets.

Page: https://tryals.app/practice/psychology-i/parental-care-and-conflict/sort-each-parental-behavior-by-the-form-of-care-it-represents