How can we help?

You can also find more resources in our Help Center.

68 terms

MEIOSIS

STUDY
PLAY
Different form of same gene
Allele
Chromosomes that determine sex
Sex Chromosomes
2 parents give rise to offspring
Sexual
Expressed Characteristic
Traits
All chromosomes besides sex chromosomes
Autosomes
Chromosomes of same type (appearance looks alike)
Homologous
Body Cells, (2n), "pair"
Diploid
Egg and sperm (sex cell)
Gametes
Gametes (1n)
Haploid
A pair of chromosomes of the same type are called ______ chromosomes.
Homologous.
In ______ reproducing organisms, offspring get one chromosome from their mom and one from their dad.
Sexual
Chromosomes have genes on them that will code for or determine an organism's ______.
Traits
Different forms of the same gene are called _______ (ex. Brown hair gene or blonde haired gene)
alleles
A name for a cell that has 2 copies of each type of chromosome in each cell would be called a ______.
Haploid
Haploid cells that are used in sexual reproduction, like sperm and eggs are called _______.
Gametes
Chromosomes in a nucleus of an organism that code are not used to determine the sex of an organism are called the _________.
Autosomes
The X and Y chromosomes in humans are called the ___________.
Sex chromosomes
If a cell has 2 chromosomes, is it a gamete or a somatic cell?
Somatic
[(xx)] Chromosomes only look like this before cell division, so how many times would the cells need to divide?
twice
[(8)] haploid or diploid?
Haploid
What is another name besides gametes for them?
Sex Cell
If a goat has 60 chromosomes in a diploid cell, how many homologous chromosome pairs are there in a diploid cell?
30 pairs
If rice has 24 chromosomes in a diploid cell, how many chromosomes are in the haploid cell?
12
If a king crab has 104 chromosomes in a haploid cell, how many pairs of homologous chromosomes are in diploid cells?
104 pairs
If a bat has 22 pairs of homologous chromosomes in diploid cells, how many chromosomes are in diploid cells?
44
Dogs have 78 chromosomes in their diploid cells. How many chromosomes are in their haploid cells?
39
Horses have 32 chromosomes in their diploid cells. How many chromosomes are in their haploid cells?
19
Cats have 38 chromosomes in their diploid cells. How many chromosomes are in their haploid cells?
19
What is a karyotype?
A picture of all the chromosomes.
XX
female
XY
male
_________ is the process of making haploid sex cells.
Meiosis
The purpose of meiosis is to ______ chromosome number and create genetic ______.
Reduce; diversity
If the diploid number of an organism is 20, how many will be present in a cell after meiosis?
10
Cells go through ___ rounds of division in meiosis. Cells double DNA ____ but divide ____.
2, once, twice
If a skin cell has 40 chromosomes, how many will a sperm have in the same organism?
20
What occurs before Meosis I but not Meiosis II?
Interphase
What are 2 activities that a cell goes through in premeiotic interphase?
chromosomes duplicate, centrosomes double
What phase do chromosomes duplicate and centrosomes double?
Interphase
What phase do chromosomes condense?
Prophase I
What phase do sister chromatids join with homologs in synapsis to form tetrads?
Prophase I
What phase do centrosomes migrate to opposite poles?
Prophase I
What phase is the longest phase of meiosis?
Prophase I
What phase do spindle fibers form?
Prophase I
What phase does the nuclear envelope and nuclei disintegrate?
Prophase I
What phase does the exchange of chromosome segments between homologous chromosome occur?
Crossing over
What phase does Crossing Over happen in between?
Prophase I and Metaphase I
What phase do tetrads line up?
Metaphase I
What phase do spindle fibers from each pole are attached?
Metaphase I
What phase are tetrads pulled apart?
Anaphase I
What phase are sister chromatids pulled to either pole?
Anaphase I
What phase does a nuclei reform around pairs of sister chromatids?
Telophase I
What phase does cytoplasm divide and make 2 daughter cells that are haploids but have 2 chromatids?
Telophase I
Double chromosomes that you get from your mom and dad are called __________-.
Homologous
During prophase I what do chromosomes do?
condense
What is the process of genes switching places on homologous chromosomes?
Crossing over
At the end of Anaphase I what is moved to opposite sides of the cell?
Pairs of sister chromatids
What do the nuclei reform around in Telophase I?
Pairs of sister chromatids
What phase do chromosomes not duplicate and preparations are made for Meiosis II?
Interkinesis
What phase do pairs of sister chromatids have spindle fibers?
Prophase II
What phase do sister chromatids line up?
Metaphase II
What phase do pairs of sister chromatids are pulled apart?
Anaphase II
What phase makes 4 daughter cells with haploid number of chromosomes?
Telophase II
What are separated during Meoisis II?
2 haploid daughter cells of each type
How many daughter cells are made at the end of meiosis II?
4
How many cells are going through prophase II at a time?
2
During which phase do sister chromatids line up in the middle?
Metaphase II
During which phase are sister chromatids pulled apart?
Anaphase II