Chapter 6.2 CC Flashcards Preview

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Flashcards in Chapter 6.2 CC Deck (20):
1

How do purple sea urchins reproduce

-bring gametes together by releasing big clouds of sperm and egg cells into the water where it gets fertilized

2

How come when the purple sea urchin gametes are in the air, the green sea urchin gametes don't get fertilized?

-sperm and egg cells of all species of sea urchins have unique protein on their surfaces, only works if right protein meets right sugar

3

What is sugar-protein recognition

-fertilization in a particular species of sea urchins will only occur if right sugar meets right protein

4

What is mating

-process that gametes arrive at same time and place

5

What are the two ways of sexually reproducing?

-internal fertilization
-external fertilization

6

What conditions must be made in order for cell division after fertilization?

-enough nutrients for rapidly diving embryo
-warm temperature so proteins and enzymes function properly during chemical reactions in embryo
-enough moisture so embryo doesn't dry up
-embryo must be protected by predators and other environmental factors

7

What happens in external fertilization?

-Sperm and egg cell meet outside bodies of parents
-come in contact with egg cell of same species, fertilization

8

Name 2 examples that use external fertilization?

-sea urchins
-salmon
-mosses and ferns, carried by water

9

What is spawning?

-what make and female of both species release gametes into water

10

How many eggs do a female sea urchin produce?

Several millions per year,
80% mass during mating season

11

Describe internal fertilization?

-sperm cells deposited in females body where they meet the egg cell

-single sperm cell penetrated into egg cell
egg cell changes electrical charge, not allowing more sperm to come in

- embryo develops, nourished in body for long time, embryo protected from predators

12

What is preventing the entrance of more then one sperm cell going into egg cells important?

-to make sure only one set of make chromosome can unite with chromosomes in the nucleus of cell

13

What is sexual reproduction

-reproduction that requires two parents and produces offspring genetically different from each other, either parent or any other member of species

14

What are the 3 stages of sexual reproduction?

-Mating, fertilization, development

15

What are the advantages of sexual reproduction?

-offspring genetically different from parents

16

What is the difference of sexual reproduction?

-parent care difference

17

What are the 2 advantages of external fertilization?

-little energy to find mate
-greater number of offspring can repopulate area after disaster

18

What is the disadvantage of external fertilization?

-gametes, embryos and offspring unprotected and often preyed upon

19

What is the advantage of internal fertilization?

-more protection from embryo
more parental care for offspring

20

What are the 2 disadvantages of internal fertilization?

-fewer offspring produced so if number of predators increase, population decrease
-more energy needed to find mate