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Ch 10
Meiosis and Sexual Reproduction
77
Biology
Undergraduate 1
05/01/2011

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Term
Which cells in the body have Haploid number of chromosomes?
Definition
Gametes
Term
Meiosis is the nuclear division that reduces the chromosome number from what, to what?
Definition
Diploid:Haploid
Term
What number refers to the complete number of chromosomes in a cell?
Definition
Diploid
Term
When a sperm fertilizes an egg it creates a one celled structure with what number of chromosomes?
Definition
Zygote: Diploid
Term
What are the pairs in a somatic cell called?
Definition
Homologous Chromosomes
Term
How many chromosomes do a human have?
Definition
46
Term
How many nuclear divisions do Meiosis require?
Definition
2
Term
What is the resulting product of Meiosis?
Definition
4 Daughter cells
Term
The parent cell that divides by meiosis contains what number of chromosomes?
Definition
Diploid
Term
What number of chromosomes do the daughter cells contain?
Definition
Haploid
Term
Are the daughter cells genetically identical to the parent cell in Meiosis?
Definition
No, Nor to eachother
Term
Prior to Meiosis
i what has to happen to the DNA?
Definition
DNA replication
Term
In meiosis how many sister chromatids per chromosomes are visible during prophase I?
Definition
2
Term
What is synapsis?
Definition
Homologous chromosomes line up and come together side by side.
Term
At the end of meiosis I 2 daughter cells form. Do they still have homologous pairs of chromosomes?
Definition
Yes
Term
At the end of meiosis II how many daughter cells form? Are they in duplicated form or as daughter chromosomes?
Definition
4: Daughter Chromosomes
Term
Daughter cells formed from meiosis become what in your body?
Definition
Gametes
Term
Does DNA replicate during interkinesis?
Definition
No
Term
How does meiosis guarantee that each gamete formed is genetically unique?
Definition
By Crossing over and Independent-Assortment
Term
What happens to the centrosomes and what begins to form during Prophase I?
Definition
Move toward opposite poles: Spindle Fibers
Term
What happens to the Nuclear membrane and Nucleolus during Prophase I?
Definition
Fragments: Disapears
Term
What happens to the homologous chromosomes during Prophase I?
Definition
They undergo synapsis
Term
During Metaphase I where do the homologous pairs line up?
Definition
Metaphase plate
Term
What happens in Metaphase I that generates genetic variety?
Definition
Independent Assortment
Term
What happens to the Spindle fibers during Telophase I ?
Definition
They disapear
Term
During Telophase I do a new nuclear membrane need to form around the seperated homologues?
Definition
No
Term
During telophase I if a cell were to split in 2, which process occurs to split the cytoplasm?
Definition
Cytokinesis
Term
What happens to all of the chromosomes during metaphase II?
Definition
The align at the Metaphase plate
Term
What happens during Anaphase II?
Definition
Sister chromatids seperate and become daughter chromosomes
Term
What happens during Prophase I that generates genetic variability?
Definition
Crossing Over
Term
When does the nuclear membrane reform?
Definition
Telophase II
Term
When does the chromatin condense?
Definition
Prophase I
Term
When do the chromosomes elongate into chromatin?
Definition
Telophase II
Term
Are the daughter chromosomes formed at the end of Meiosis Haploid or DIploid?
Definition
Haploid
Term
Where does meiosis occur in the body?
Definition
Reproductive organs
Term
Bivalents are formed in what phase of meiosis?
Definition
Prophase I
Term
What does the life cycle refer to?
Definition
All reproductive events that occur from one generation to the next.
Term
In human males where does spermatogenesis occur to form sperm?
Definition
In the testes
Term
In human females where does oogenesis occur to form eggs?
Definition
In Ovaries
Term
In males testes contain stem cells called?
Definition
Spermatogonia
Term
The diploid cell that will divide by Meiosis I in males is called?
Definition
Primary spermatocytes
Term
After meiosis I and cytokinesis 2 what are formed in males?
Definition
Secondary spermatocytes
Term
After Meiosis II and cytokinesis 4 what are formed in males ?
Definition
Spermatids
Term
Upon maturation at the end of Meiosis what is formed in males?
Definition
Sperm
Term
Ovaries contain stem cells called?
Definition
Oogonia
Term
What is the diploid cell that will divide by meiosis I in females?
Definition
Primary Oocytes
Term
After meiosis I and cytokinesis what structures are formed in females?
Definition
Secondary oocyte and Polar bodies
Term
The secondary oocyte begins meiosis II but stops?
Definition
at Metaphase II
Term
If sperm feritlizes the secondary oocyte what will the secondary oocyte finish?
Definition
Meiosis II
Term
What do you call the correct number of chromosomes in a species?
Definition
Euploidy
Term
What do you call it when there is a change in the number of chromosomes?
Definition
Aneuploidy
Term
What is nondisjunction?
Definition
failure of homologous chromosomes or sis chromatids to separate properly during meiosis
Term
What is Monosomy?
Definition
When individual only has 1 type of chromosome
Term
What is primary nondisjunction?
Definition
Happens in Meiosis I: both of homologous pair go to same daughter cell
Term
What is secondary nondisjunction?
Definition
In meiosis II: both daughters go to same gamete
Term
What is the common name of trisomy 21?
Definition
Down Syndrome
Term
If a parent had a child with down syndrome nondisjunction may have occured in who?
Definition
Both : male and female
Term
What is Sawyer syndrome?
Definition
Lack hormone in Testes
Term
How many X sex chromosomes do turner individuals have?
Definition
1
Term
Is a person with Klinefelter male or female?
Definition
Male
Term
If a parent had a child with Klinefelter syndrome nondisjunction occured in who?
Definition
Both: Male and female
Term
What does the Karyotype for someone who has Klinefelter look like?
Definition
XXY or XXXY
Term
What does the karyotype for someone who has Turner Syndrome look like?
Definition
XO
Term
If a parent had a child with Jacobs syndrome nondisjunction may have occured in who?
Definition
MALE
Term
What does the karyotype for someone who has Jacobs syndrome look like?
Definition
XYY
Term
What is deletion?
Definition
When end of chromosome breaks off or 2 simulatneous breaks lead to loss of internal segmant
Term
What is duplication?
Definition
Prescence of chromosomal segment more than once in same chromosome
Term
What is inversion?
Definition
Occurs when segment of chromosome is turned 180 degrees
Term
What is translocation?
Definition
movement of chromosome segment from one to another non homologous chromosome
Term
In what phase does crossing over occur?
Definition
Prophase I
Term
Does DNA replicate during interkinesis?
Definition
No
Term
What phases does nondisjuntioning occur?
Definition
Anaphase I and II
Term
In humans how many chromosomes does the secondary oocyte have?
Definition
23
Term
When one chromosome piece moves to another non homologous chromosome what has taken place?
Definition
Translocation
Term
Do plants have centrioles?
Definition
NO
Term
In meiosis the stage where sister chromatids separate is called?
Definition
Anaphase II
Term
What is intresting about the size of the secondary oocyte compared to the polar body?
Definition
The secondary oocyte is much bigger than the polar body
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