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Meiosis

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k18v2's version from 2017-12-03 14:39

Section 1

Question Answer
What information do chromosomes contain?genetic
What cell is divided that results in 2 genetically identical daughter cells?somatic
What must cells divide for?growth, repair of tissues, and asexual reproduction
What type of cells does Mitosis occur?Somatic
How many chromosomes do humans have? 46
Does every organism have the same number of chromosomes?No, each organism has a unique number of chromosomes
What does diploid mean?2 sets
How is diploid written?"2N"
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Section 2

Question Answer
What does homo mean?same
Define Meiosisthe process in which the number of chromosomes in the original cell is reduced by half through the separation of homologous chromosomes
Where does meiosis occur?occurs in sex organs only
What are egg and sperm called?gametes
If human diploid nunber is 46, what's it's haploid number? 23
When does meiosis occur in humans?in males it begins at puberty and in females it is before birth- all eggs are produced before birth and at puberty eggs mature
Fertiliziationprocess by which an egg and sperm unite
Zygotefertilized egg
Embryoorganism in early stage of development
What is the reason siblings look different?crossing over increases genetic variaton
what is crossing over? a process that occurs during the 1st division where homologous chromosomes exchange genes
Define homologous(of chromosomes) pairing at meiosis and having the same structural features and pattern of genes.
When do homologous chromosomes separate?2nd division of meiosis
What does crossing over increase?Genetic Variation
describe homologous chromosomesthey look alike, they are the code for same traits, they recieve one from each parent
Body of an adult organism have 2 sets of __________ chromosomes - 1 set from ______ parent and 1 set from ____ parenthomologous; female; male
Males (XY) - sex organs are the ______ in humanstestes
Females (XX) - sex organs are the _______ in humansovaries
Meiosis also occurs in ,,,sex organs of other animals, plants, fungi, etc.
Meiosis prodouces sex cells - cells with 1/2 the number of ___________ as the original cellchromosomes
Meiosis prodouces ___ cells - cells with 1/2 the number of chromosomes as the original cellsex
In males, meiosis produces _ _____4 sperm
In females, meiosis produces _ ___1 egg
Where does crossing-over occur?Prophase 1
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Question Answer
What would happen if interphase didn't occur?No DNA in new cell
How would you know if two chromosomes were homologous?they are identical chromosomes
What happens during crossing over and what is the significance?genetic information is exchanged during the process crossing over in prophase 1 and the significance is that it is the reason why siblings look different
What's the difference between metaphase 1 and 2?in metaphase one, chromosomes line up along the equator in pairs while in metaphase 2, homologs line up along the equator in one line
What occurs during nondisjunction and the effect on the resulting cells?When a cell receives too many or too few chromosomes and the effect is a crazy looking person
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Question Answer
What would happen if interphase didn't occur?No DNA in new cell
How would you know if two chromosomes were homologous?they are identical chromosomes
What happens during crossing over and what is the significance?genetic information is exchanged during the process crossing over in prophase 1 and the significance is that it is the reason why siblings look different
What's the difference between metaphase 1 and 2?in metaphase one, chromosomes line up along the equator in pairs while in metaphase 2, homologs line up along the equator in one line
What occurs during nondisjunction and the effect on the resulting cells?When a cell receives too many or too few chromosomes and the effect is a crazy looking person
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Question Answer
Interphase occurs once before the process beginsboth meiosis and mitosis
Process ends with identical cellsmitosis
Produces gametesmeiosis
Produces 4 cells that each have 23 chromosomesmeiosis
Crossing over occursmeiosis
Process is important for growth and repairboth meiosis and mitosis
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Question Answer
Prophase 1homologous chromosomes pair up and form tetrad
Metaphase 1homologs line up along equator
Anaphase 1spindle fibers move homologous chromosomes to opposite sides
Telophase 1 and cytokinesisCytoplasm divides, 2 daughter cells are formed
Prophase 2crossing-over occurs
Metaphase 2chromosomes line up along equator, not in homologous pairs
Anaphase 2chromatids separate
Telophase 2 and cytokinesisNuclear membrane reforms, cytoplasm divides, daugter cells formed
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