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Flashcards in Sexual Reproduction Deck (27):
0

Describe it

Reproduction by two parents
Offspring are genetically different
Relies on MEIOSIS to create sex cells (gametes)

1

Gametes and Zygote difference

Gametes Are HAPLOID HALF THE CHROMOSOME NUMBER
Zygote are diploid normal number of chromosomes

2

Meiosis

Separates homologous chromosomes then chromatids
Happens in the gonads
Produces haploid cells
Introduces greater variation and diversity to population

3

Prophase I

Homologous chromosomes are next to each other

4

Prophase I

Homologous chromosomes are next to each other

5

Metaphase I

Homologous chromosomes are lined up ward

6

Anaphase I

Homologous chromosomes separate

7

Telephase I

Each daughter cells has two chromosomes

8

Male gonads

Testes, produces sperm
Need to be in scrotum to keep temperature around 35.5

9

Sperm

Produced by meiosis
Haploid
Stored in dpidydymus

10

Lutenising hormone in males

Causes testes to produce larger amount of testosterone

11

Pathway of sperm

Epididymis - Vas Deferens - urethra (fluids are added) which forms semen

12

How many eggs are produced in females

1, there are not four cells produced because only one haploid egg gets most of the nutrients

13

Female gonads are...

Ovaries

14

Where does fertilization happen

Fallopian tubes

15

What helps move the eggs

Cilia in the tubes

16

How do eggs mature

In a follicle.
Lutenising hormone causes the follicle to get bigger and causes the egg to be released.

17

What is the folicle called when egg is release

Corpus luteum

18

What is produced as the follicle gets bigger

Oestrogen is produced. Gets the uterus ready for pregnancy and causes uterus lining to get thicker

19

What does the corpus luteum produce

Progesterone - which maintains uterus lining
If woman does not get preg, the copus gets smaller and levels of progesterone decreases. And the uterus lining is lost

20

Gamete of plants

Pollen (male) egg female egg)

21

Wind pollinated flowers

Pollen are small and dry
Large amounts are produced
Flowers are small

22

Disadvantages of wind pollination

Cannot control direction of it
Relies only on luck

23

Animal pollination

Flowers and petals brightly colored
Strong scent
Nectar may be secreted
Stigmas are taller than stamens to prevent self pollination

24

A seed

Is a fertilized egg

25

Where are plant eggs found

Ovaries

26

Where is pollen produced

Anther produces pollen by meiosis