CHROMOSOMES ARE DUPLICATED. THE RESULTING SISTER CHROMTIDS ARE HELD TOGETHER AT THE CENTRMERE. THE CENTROSOMES ARE ALSO DUPLICATED.
DEFINE PROPHASE 1 PHASE OF MIEOSIS
DEFINE PROMETAPAHSE 1 OF MEIOSIS
DEFINE METAPHASE 1 OF MEIOSIS
DEFINE ANAPHASE 1 OF MEIOSIS
A tetrad is made up of
two homologous chromosomes, each consisting of two chromatids.
A crossover in meiosis is an exchange of genetic material between....
non-sister chromatids of homologous chromosomes.
T OR F
Crossing-over occurs during prophase I of meiosis.
T OR F
Crossing-over allows the reassortment of linked genes.
The cell cycle in a certain cell type has a duration of 16 hours. The nuclei of 660 cells showed 13 cells in anaphase. What is the approximate duration of anaphase in these cells?
16 hours × 60 minutes/hour = 960 minutes.
13 cells in anaphase ÷ 660 total cells = 2% of the cells in anaphase
2% of 960 is approximately 19 minutes.
During which stage of meiosis is the diploid number of chromosomes reduced to the haploid number of chromosomes?
How many chromosomes do human germ-line cells contain? ____ How many cells do somatic (body cells – skin, muscle cells) have? ______ How many chromosomes do human gametes have? _____
How many chromosomes do human germ-line cells contain? ___46_ .
How many cells do somatic (body cells – skin, muscle cells) have? __46____ .
How many chromosomes do human gametes have? __23___
At what stage of meiosis does crossing-over occur?
1.Describe/identify the differences between spermatogenesis and oogenesis.
Oogenesis is the name for meiosis that occurs in female germ-line cells – this process creates one large egg (ovum) cell and 3 smaller, non-viable polar bodies due to the uneven division of cytoplasm during cytokinesis. Spermatogenesis is the name for meiosis that occurs in male germ-line cells – this process results in 4 viable sperm cells
Why do the chromosomes in the cells in meiosis I look different from those produced in meiosis II?
The chromosomes look in different in meiosis I because both chromatids are still attached to the centromere – in meiosis II the chromatids separate from one another so the chromosomes are only made up of one chromatid
Describe what a pair of homologous chromosomes has in common.
Homologous chromosomes are the same size, same shape, and have genes for the same trait (like eye color) on the same location
DEFINE TELOPHASE 1 OF MEIOSIS
DEFINE PROPHASE 2 OF MEIOSIS
DEFINE PROMETAPHASE 2 OF MEIOSIS
DEFINE METAPHASE 2 OF MEIOSIS
SISTER CHROMATIDS LINE UP AT THE METAPHASE PLATE.
DEFINE ANAPHASE 2 OF MEIOSIS
DEFINE TELOPHASE 2 OF MEIOSIS
PLATES ON THE SIDE OF THE CENTROEME WHERE THE MICROTUBLES CONNECT.
IS THERE DNA PRODUCTION IN PHASE 2 PG MEIOSIS?
THE CROSS OVER OF SISTER CHROMTIDS OF A CHROMOSOME.