Adaptations in Redback Spiders Flashcards

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1
Q

The pollen from a 4n (68 chromosomes) plant is crossed with the ovum from a 2n plant (34 chromosomes). What would be the chromosome number in the offspring?

A

51 chromosomes

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2
Q

What is the region where members of different species mate and produce hybrids?

A

hybrid zones

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3
Q

How might hybridization impact speciation?

A

Reinforcement of reproductive barriers

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4
Q

What is fitness?

A

How many viable, fertile offspring an individual (or allele) leaves in subsequent generations relative to others in the population

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5
Q

What is an adaptation?

A

Trait or behaviour that makes an organism better suited for its environment

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6
Q

What is sexual cannibalism?

A

When one sex consumes the other during sexual reproduction

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7
Q

What is the mistaken prey hypothesis? If this hypothesis is correct, what would you predict?

A

Females mistake males for prey. If this hypothesis was correct, females would sometimes attack males as soon as they enter her web.

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8
Q

What is the mate rejection hypothesis? What would you predict?

A

Females eat males that are unsuitable as mates. The prediction would be cannibalized males would be smaller and produce fewer offspring that non-cannibalized males.

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9
Q

What is the hungry lover hypothesis? What would you predict?

A

Females eat their mates because they are hungry. The prediction would be females would be more likely to cannibalize males if their diet has not been supplemented.

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10
Q

Of the three hypothesis for the sexual cannibalism of the redback spiders, which one was found to be true?

A

They hungry lover hypothesis.

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11
Q

How does the female consume the male spider?

A

He dangles hid abdomen in front of her jaws

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12
Q

Why does the female redback spider consume the male?

A

The female gains nutrients if she eats the male

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13
Q

What is the paternal investment hypothesis?

A

Males by contributing nutrients to increase the number and size of their offspring.

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14
Q

If the paternal investment hypothesis is correct, what would you expect?

A

Consuming he male would significantly increase the number and mass of eggs in the female’s egg sac.

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15
Q

What is the nuptial gift hypothesis?

A

Males benefit from self-sacrifice by increasing their fertilization success

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16
Q

If the nuptial gift hypothesis is correct, what would you expect?

A

Cannibalized males would father more offspring than non-cannibalized males.

17
Q

Why of the hypothesis as to why males don’t attempt to escape is correct?

A

The nuptial gift

18
Q

Why does the male sacrifice himself?

A

The male increases the length of copulation by sacrificing himself

19
Q

Who is passing on more alleles to the next generation? Cannibalized or non-cannibalized?

A

Cannibalized