Ch 12.4 Lecture

If an organism has 12 pairs of chromosomes in the nucleus, after a cell goes through MITOSIS, how many pairs of chromosomes will there be in the nucleus of the new cells?

If a cell splits in to two during mitosis, how does each daughter cell get a complete set of the DNA?

All the cells in the human body are haploid except for the egg and sperm cells.

Homologous chromosomes have the same genes at the same locations, but they may have different forms (alleles) for that gene.

Diploid cells are abbreviated as 2N because they have two of every chromosome.

Egg cells and sperm cells are produced by the process of mitosis.

DNA does not have to replicate before meiosis because the egg cells and sperm cells only need half of the DNA.

Meiosis consists of two cycles of PMAT.

Metaphase in Meiosis 1 is different than metaphase in mitosis because...

What stage does crossing over take place?

Each chromosome has two copies in meiosis 1.

The DNA replicates again between meiosis 1 and meiosis 2.

Meiosis results in four haploid cells (1N) from one diploid (2N) parent cell.

Why are genes on the same chromosome not always inherited together?

Genes that are far apart on chromosomes are MORE likely to be inherited together than two genes that are close together.