Question

I NEED ANSWERED ASAP!!!

First, draw a cell with 6 chromosomes as it moves through the phases of meiosis.

Explain what nondisjunction is. Draw and copy a picture of your drawing of your cell with 6 chromosomes to start with as it goes through the phases of meiosis with nondisjunction occurring in one chromosomes pair in meiosis I. Be sure to label the phases and indicate how many chromosomes each resulting cell will have. Label the monosomies vs. trisomies.

EXTRA DETAILED PLEASE!!!!

Answer 1

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.

NONDISJUNCTION DURING MEIOSIS 1

Gametes (eggs and sperm) are made through meiosis. One cell divides into four daughter cells through the combined processes of meiosis I and meiosis II. Meiosis I is similar to mitosis, but in meiosis I each pair of chromosomes lines up next to each other in preparation for making gametes, whereas in mitosis, the chromosomes are all in one line. In anaphase of meiosis I, nondisjunction happens when a pair of homologous chromosomes does not separate. In the resulting cells, one cell has two copies of a chromosome, while the other cell has no copies. When each of these cells goes on to divide into two cells during meiosis II, the four total cells produced will all have chromosomal abnormalities.

n +1 n +1 Nondisjunction During Anaphase I Metaphase l Metaphase l T Gametes

In this when all homologous chromosome are aligned at metaphase plate in metaphase 1 and nondisjunction occurs at Anaphase 1 result in non separation of homologous chromosome. In upper figure here nondisjunction occurs at 2 homologous chromosome result in abnormal gametes after meiosis 2 .

Nondisjunction Meiosis I Meiosis lI n+ 1 nondisjunction during meiosis I n+1 nondisjunction during meiosis ll

First division nondisjunction Normal disjunction First meiotic division Nommal disjunction Nomal disjunction Second division mondisijunction Second meiotic division Haploid Disomic Disomic Trisomic Monosomic gamete (normal) (normal) Haploid Trisomic Tisomic Monosomic Monosomic