BIO 202 Lecture Notes - Lecture 10: Sister Chromatids, Synaptonemal Complex, Homologous Chromosome
Related textbook solutions
31.????? interphase A. cytoplasm divided between the two daughter cells
32.????? chromosomenumber B. final phase of mitosis; daughter nuclei form
33.????? chromatid C. sum total of chromosomes in all cells of a given
34.????? cytokinesis D. chromosomes condense and mitotic spindle
begins to form
35.????? metaphase E. chromosomes line up at spindle equator
36.????? alleles F. sister chromatids separate, move to opposite
spindle poles now
37.????? prophase G. none between meiosis I and II
38.????? telophase H. half of a chromosome in prophase
39. ????? anaphase I. different molecular forms of the same gene
-Complete the following sentences: metaphase of mitosis, prophase II of meiosis, crossing over, anaphase I of meiosis, variable, random fertilization, identical, random orientation, metaphase I of meiosis, prophase I of meiosis, metaphase II of meiosis, reduction division
Two processes that occur during meiosis produce genetically ____________ cells.
In a process called ____________ , paired homologous chromosomes align randomly at the cell equator. This occurs during this stage of cell division: ____________ .
In a process called ____________ , genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: ____________ .
-Complete the following paragraph to describe nondisjunction and the resulting effects on chromosome number.
words: euploidy, primary nondisjunction, nomal, nondisjunction, secondary nondisjunction, homologous chromosomes, abnormal, trisomy, monosomy, sister chromatids, aneuploid
1.During meiosis I, ____________ separate and move towards opposite ends of the poles.
2.During meiosis II, ____________ separate and move towards opposite ends of the poles.
3.During meiosis I, if both members of a homologous pair go into the same daughter cell, ____________ is said to occur and no normal gametes are produced.
4.During meiosis II, if the sister chromatids fail to separate and both daughter chromosomes go into the same gamete, ____________ is said to occur. Half the gametes are aneuploid while the other half are euploid.
5.If an egg that contains 24 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.
6.If an egg that contains 22 chromosomes instead of 23 chromosomes is fertilized by a normal sperm, ____________ is said to have occurred.
Determine whether the following applies to mitosis, meiosis, orboth; also identify the specific stage of cell division thatapplies (e.g. mitosis prophase, meiosis anaphase II, etc)
1) chromosomes pairs line up across the center of the cell
2) sister chromatids seperate
3) spindle fibers separate homologous chromosomes
4) 4 haploid daughter cells are produced
5) a cell 1st undergoes DNA replication
6) chromosomes line up single file across the middle of thecell
7) sister chromatids separate from each other
8) 2 haploid daughter cells form
9) the nuclear membrane re forms
10) spindle fibers attach to pairs of homologous chromosomes
11) the nuclear membrane begins to dissolve
12) centrosomes duplicate
13) synapsis and crossing over occurs
14) 2 diploid daughter cells form