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Science > Unit 7F > Flashcards

Unit 7F Flashcards

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1
Q

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

A

Identically genetic halves

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2
Q

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

A

Same sex;100% of same genes

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3
Q

Do identical twins have the same fingerprints?

A

No; they have different fingerprints

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4
Q

Mirror twins

A

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

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5
Q

In mirror twins, what are their differences?

A

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

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6
Q

Identical twins occur in approximately…..

A

One in every 250 births

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7
Q

In fraternal twins, what does the mother release

A

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

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8
Q

What is the sex of fraternal twins?

A

Same sex, or different sexes

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9
Q

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

A

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

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10
Q

In identical twins, when does the zygote divide?

A

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

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11
Q

Half identical twins

A

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

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12
Q

Half identical twins AKA

A

Polar-body twins

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13
Q

In identical twins, it splits into_______ identically genetic halves

A

Two

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14
Q

What percent of shared DNA do half identical twins share?

A

75%

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15
Q

Conjoined twins are……

A

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

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16
Q

In conjoined twins, when do they attempt to separate?

A

After 12 days

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17
Q

How can conjoined twins also form

A

They can also form as the separate zygotes fuse

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18
Q

Most conjoined twins are what type of twins

A

Mirror twins

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19
Q

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

A

1 in 55 conjoined twins survive the first year of life

20
Q

What were the original conjoined twins known as

A

Siamese twins which were Eng and Cheng Bunker

21
Q

What is a zygote

A

A fertilized egg

22
Q

Simple animals tend to reproduce__________

A

Asexually

23
Q

Budding and examples

A

Part of parents body develops into an independent organism

Ex:sponges, hydra

24
Q

Fragmentation and example

A

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

25
Q

Regeneration and examples

A

When organism grows back missing part.

Ex: sea stars, planarian

26
Q

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

A

Two sex cells;zygote;fertilization

27
Q

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

A

Multicellular; sexually

28
Q

What are gametes

A

Sperm and eggs

29
Q

Where is sperm produced? Where are eggs produced?

A

Sperm is made in testis

Eggs are made in the ovary

30
Q

Hermaphroditic and examples

A

Organisms that contain sperm and egg

Ex: earthworm and wrasse fish

31
Q

Parthenogenesis

A

When female egg develops without fertilization

32
Q

External fertilization

A

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

33
Q

Internal fertilization

A

Within the females body, egg and sperm join

34
Q

How do all mammals reproduce?

A

Sexually

35
Q

Monttremes

A

Mammals that lay eggs

36
Q

Marsupials

A

Mammals that give birth

37
Q

Placental mammals

A

Mammals which give birth to fully develop young

38
Q

The female reproductive system(3)

A

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

39
Q

Fallopian tube

A

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

40
Q

Ovary

A

Where the eggs are produced through cell division

41
Q

What regulates menstruation

A

Progesterone

42
Q

Male reproductive system

A

Produces sperm and delivers it to the female reproductive system

43
Q

Epididymis

A

Where sperm matures

44
Q

Semen

A

Sperm and fluids that are mixed

45
Q

Mitosis

A 
46
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46
Q

Meiosis

A 
46
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                        92
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                23 23 23 23

Science (13 decks)

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