Unit 7F

Question 1

When the egg splits into identical twins, it splits into 2………..

Answer 1

Identically genetic halves

Question 2

What sex are identical twins? And what percent if the same genes do they have?

Answer 2

Same sex;100% of same genes

Question 3

Do identical twins have the same fingerprints?

Answer 3

No; they have different fingerprints

Question 4

Mirror twins

Answer 4

25% of identical twins due to egg dividing late within the time period.

Question 5

In mirror twins, what are their differences?

Answer 5

May have opposite whorls in hair, one may be right handed, the other left handed

Question 6

Identical twins occur in approximately…..

Answer 6

One in every 250 births

Question 7

In fraternal twins, what does the mother release

Answer 7

2 eggs, simultaneously, and both are fertilized by separate sperm

Question 8

What is the sex of fraternal twins?

Answer 8

Same sex, or different sexes

Question 9

Fraternal twins share what percent of the same DNA? They are no more alike than _________ siblings

Answer 9

50% of the same DNA; no more alike than two siblings

Question 10

In identical twins, when does the zygote divide?

Answer 10

A single zygote divides within 4-8 days after egg fertilization.

Question 11

Half identical twins

Answer 11

The egg divides before it is fertilized, and each half is fertilized by separate sperm

Question 12

Half identical twins AKA

Answer 12

Polar-body twins

Question 13

In identical twins, it splits into_______ identically genetic halves

Answer 13

Two

Question 14

What percent of shared DNA do half identical twins share?

Answer 14

75%

Question 15

Conjoined twins are……

Answer 15

They are identical twins which fail to separate within the 4-8 day time period after fertilization

Question 16

In conjoined twins, when do they attempt to separate?

Answer 16

After 12 days

Question 17

How can conjoined twins also form

Answer 17

They can also form as the separate zygotes fuse

Question 18

Most conjoined twins are what type of twins

Answer 18

Mirror twins

Question 19

Approximately how many conjoined twins survive the first year of life?

Answer 19

1 in 55 conjoined twins survive the first year of life

Question 20

What were the original conjoined twins known as

Answer 20

Siamese twins which were Eng and Cheng Bunker

Question 21

What is a zygote

Answer 21

A fertilized egg

Question 22

Simple animals tend to reproduce__________

Answer 22

Asexually

Question 23

Budding and examples

Answer 23

Part of parents body develops into an independent organism

Ex:sponges, hydra

Question 24

Fragmentation and example

Answer 24

When organism breaks into one or more parts and each part can grow into a separate individual
Ex: sea stars

Question 25

Regeneration and examples

Answer 25

When organism grows back missing part. | Ex: sea stars, planarian

Question 26

Offspring are produced by the joining of ___ ___ _____(gametes) to form a ______. This joining of gametes is known as ____________

Answer 26

Two sex cells;zygote;fertilization

Question 27

Sexual reproduction occurs within most _____________ organisms. Most animals reproduce ________.

Answer 27

Multicellular; sexually

Question 28

What are gametes

Answer 28

Sperm and eggs

Question 29

Where is sperm produced? Where are eggs produced?

Answer 29

Sperm is made in testis | Eggs are made in the ovary

Question 30

Hermaphroditic and examples

Answer 30

Organisms that contain sperm and egg | Ex: earthworm and wrasse fish

Question 31

Parthenogenesis

Answer 31

When female egg develops without fertilization

Question 32

External fertilization

Answer 32

Occurs outside organisms body. When sperm fertilized egg outside of females body in a moist environment

Question 33

Internal fertilization

Answer 33

Within the females body, egg and sperm join

Question 34

How do all mammals reproduce?

Answer 34

Sexually

Question 35

Monttremes

Answer 35

Mammals that lay eggs

Question 36

Marsupials

Answer 36

Mammals that give birth

Question 37

Placental mammals

Answer 37

Mammals which give birth to fully develop young

Question 38

The female reproductive system(3)

Answer 38

Produces eggs, takes care of fertilized eggs, and gives birth to offspring

Question 39

Fallopian tube

Answer 39

Where eggs mature and are releases from the ovary into a Fallopian tube

Question 40

Ovary

Answer 40

Where the eggs are produced through cell division

Question 41

What regulates menstruation

Answer 41

Progesterone

Question 42

Male reproductive system

Answer 42

Produces sperm and delivers it to the female reproductive system

Question 43

Epididymis

Answer 43

Where sperm matures

Question 44

Semen

Answer 44

Sperm and fluids that are mixed

Question 45

Mitosis

Answer 45

``` 46 /\ 92 /\ /\ 46 46 ```

Question 46

Meiosis

Answer 46

``` 46 /\ 92 /\ /\ 46 46 /\ /\ /\ /\ 23 23 23 23 ```