BIOLOGY - UNIT 4: CELL DIVISION AND REPRODUCTION MEIOSIS

A fertilized egg has received one set of __________ chromosomes from the sperm.

A fertilized egg has received one set of haploid chromosomes from the sperm.

Normally, how many chromosomes are required to determine the outward expression of a trait?

A homologous pair.

A meiotic division produces __________ daughter cells.

A meiotic division produces four daughter cells.

All the chromosomes in a diploid cell come in matched pairs except the ___________ chromosomes.

All the chromosomes in a diploid cell come in matched pairs except the sex chromosomes.

Meiosis is also referred to as:

a nuclear and cell division process.

Matched pairs of chromosomes are called:

homologous.

Genetic recombination results from:

new combinations of genes from two parents.

Each chromosome usually contains:

one gene for a particular trait.

1. Fertilization 2. Meiosis 3. Sperm 4. Genetic recombination 5. Gamete 6. Haploid

1. The fusion of gametes to produce a new cell or zygote. 2. A kind of cell division involving halving the chromosome number. 3. The male gamete. 4. The new genetic combinations of information which take place as a result of meiosis. 5. Sex cell. 6. Having a single, complete set of chromosomes.

As processes, mitosis consists of _________ division(s), and meiosis consist of __________ division(s).

As processes, mitosis consists of one division(s), and meiosis consist of two division(s).

How many chromosomes are produced by the first division during meiosis?

Double the original.

The ordered arrangement of chromosomes in gametes is the same as they were in the parent cell.

False.

In addition to cell division, meiosis also includes division of a cell's ___________.

In addition to cell division, meiosis also includes division of a cell's chromosomes.

Meiosis produces daughter cells that have a chromosome number that is __________ that of the parent cell.

Meiosis produces daughter cells that have a chromosome number that is one-half that of the parent cell.

Mitosis produces daughter cells that have a chromosome number that is __________ that of the parent cell.

Mitosis produces daughter cells that have a chromosome number that is equal to that of the parent cell.

Mitosis produces __________ daughter cells which are __________ to the parent cell.

Mitosis produces two daughter cells which are identical to the parent cell.

Which occurs more frequently, mitosis or meiosis?

Mitosis.

All the chromosomes in a diploid cell are paired.

True.

Crossing over and the separation of homologous chromosomes in the first division produces genetic variation.

True.

Cells having matched pairs of chromosomes are:

diploid.

Most of the cells in the human body are:

diploid.

When are the homologous pairs of chromosomes separated?

during the first division of meiosis.

The only haploid cells in an organism are:

gametes.