Reproduction, Embryology and Development Flashcards

1
Q

Name common ways in which a male and female insect find/attract each other for mating.

A
  1. On a host
  2. At a food source
  3. Through Lek behavior
  4. Visual displays
  5. Chemical attractants (pheromones)
  6. Sound Production
  7. Hill Topping behaviour
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2
Q

What is Lek Behavior?

A

When a male insect defends a territory on common mating ground in hopes of having a better chance of acquiring mates.

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3
Q

Why might insects meet and mate on a host? (example)

A

In Parasites such as strepsiptera, the females are wingless and attach themselves to a host with only their abdomen showing. the Males seek out the hosts in order to mate with the females.

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4
Q

Why/How might an insect meet at a food source. (example)

A

Face flies are attracted to cowpies by their olfactory emanations. the insects mate and the females oviposit on the cow pies.

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5
Q

In what insects are visual displays common?

A

Butterflies, fruit flies and fireflies

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6
Q

When are chemical attractants useful for locating a mate?

A

When a potential mate could be over a kilometer away.

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7
Q

What is hill topping behavior?

A

When males of a species fly up to and fight over the highest point of a hill in order to have the best chance of mating with a female.

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8
Q

What is courtship for insects?

A

Often a complex cascade or sequence of behaviors required for copulation to proceed.

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9
Q

What does copulation usually depend on?

A

Tactile stimulation, sometimes coupled with short-range chemical stimulation

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10
Q

What is a post-copulatory behavior in dragonflies?

A

A prolonged tandem flight (males stay attached to females) to insure that no additional males can mate with the “guarded” female

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11
Q

What is a post-copulatory behavior in some moths?

A

Male moths secrete substance from accessory gland during copulation which makes the female unreceptive to other males. May also inhibit secretion of sex attractant pheromones in the females.

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12
Q

What is a post-copulatory behavior in Orthoptera?

A

The males produce a genital plug that prevents other males from mating with the female

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13
Q

How does fertilization take place in the most primitive insects?

A

Through indirect sperm transfer.

-Males deposit a packet of sperm on the substrate which is later picked up by the female

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14
Q

What is indirect sperm transfer?

A

Males deposit a packet of sperm on the substrate which is later picked up by the female

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15
Q

How does fertilization take place in the higher orders of insects?

A

Internally
- Genitalia are often highly species specific and specialized to deliver spermatophores into the female reproductive tract. The sperm are stored in the female’s spermatheca until needed.

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16
Q

What is a spermatheca?

A

A pouch connected to the median oviduct which holds sperm in higher orders of insects

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17
Q

When and where does fertilization occur?

A

In the oviduct as the ova passes through it during ovulation.

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18
Q

How does fertilization take place in bedbugs?

A

Through direct hemocelic insemination
- Inject sperm through the integument of the female, anywhere on the body. some sperm migrate to ovaries, others are digested for energy

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19
Q

What is direct hemocelic insemination?

A

Male bedbugs Inject sperm through the integument of the female, anywhere on the body. some sperm migrate to ovaries, others are digested for energy

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20
Q

how do some male insects suppress the females feeding response in order to mate with them?

A

By bringing them gifts of food to occupy them

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21
Q

Why would a male insect bring a female a gift of food?

A

To suppress the females feeding response in order to mate with them

22
Q

What is it called when Male bedbugs Inject sperm through the integument of the female, anywhere on the body. some sperm migrate to ovaries, others are digested for energy?

A

direct hemocelic insemination

23
Q

What is the pouch connected to the median oviduct which holds sperm in higher orders of insects called?

A

spermatheca

24
Q

What type of embryologic development do insects perform?

A

meroblastic (Partial cleavage)

25
Q

Which structure undergoes nuclear cleavage during meroblastic development?

A

the zygote

26
Q

What happens to the zygote during meroblastic development?

A

undergoes nuclear cleavage, producing daughter nuclei

27
Q

What happens to the daughter nucleii of the zygote during meroblastic development?

A

they migrate to the outside of the egg and form a blastoderm

28
Q

When is a blastoderm formed?

A

When the daughter nucleii of the zygote migrate to the outside of the egg

29
Q

What is the primordium?

A

The thickened area that forms during meroblastic development that becomes the future embryo

30
Q

What forms the mesoderm and endoderm during meroblastic development?

A

Invagination of the medial plate

31
Q

What does the invagination of the medial plate during meroblastic development form?

A

the mesoderm and endoderm

32
Q

How is the ectoderm formed during meroblastic development?

A

lateral plates fuse

33
Q

What is formed when lateral plates fuse during meroblastic development?

A

the ectoderm

34
Q

Invaginations during meroblastic development form what structures?

A
  1. The Stomodeum (Mouth)

2. The Proctodeum (Anus)

35
Q

What is the Stomodeum?

A

the mouth

36
Q

What is the Proctodeum?

A

the anus

37
Q

What does the endoderm become?

A

the midgut

38
Q

What does the Mesoderm become?

A
  • musculature; body fat
  • circulatory system
  • gonads, lateral oviducts and vas deferens
39
Q

What does the Ectoderm become?

A
  • exoskeleton epidermis
  • tracheal system
  • nervous system
  • foregut and hindgut (including malpighian tubules and excretory organs)
  • medial oviduct, spermatheca and accessory glands
40
Q

What must be shed at each molt?

A

the

  • exoskeletal epidermis
  • tracheal system
41
Q

What is the rate of larval development influenced by?

A

Temperature and nutrition

42
Q

What is the course of larval development determined by?

A

Hormonal factors

43
Q

What are Ametabolous?

A

Larvae who only differ from their adult forms in size and development of gonads

44
Q

What are Hemimetabolous?

A

Larvae who gradually change through seven instars and external wing development.

45
Q

What are holometabolous

A

Larvae who differ from their adult forms by internal wing development and the formation of a pupa.
Larvae -> Pupa -> Adult

46
Q

What is the major function of the pupa?

A

To allow change. permits the larvae to diverge totally from the adult from.

47
Q

What makes having a larvae stage so advantageous?

A

The larvae and adult forms can occupy different niches. Also allows a high degree of specialization of life stages. (Larvae concerned with feeding, adults with mating etc)

48
Q

What happens during the pupa stage?

A

The body is completely rebuilt. musculature is reabsorbed and replaced in the adult

49
Q

What is the overwintering stage of the pupa?

A

A secondary function of the pupa in which the pupa can remain dormant for long periods and withstand environmental extremes.

50
Q

How is the development of Tse tse flies different?

A
  • Larvae are retained within the oviducts of the female.

- Females give birth to a single mature larvae that is dropped into the soil where it immediately pupates.

51
Q

What does viviparous mean?

A

Give birth to a single mature larvae at pupates as soon as it is dropped onto soil

52
Q

How is the development of Aphids different?

A

Aphids partake in an alternation of generations (discontinuous polymorphism)
- They may perform sexual reproduction (Maintains genetic diversity) or asexual reproduction (rapidly increase population growth)