Biology Unit 4 Test

Genetic recombination results from events during:

1. First division of meiosis 2. Fertilization

How does mitosis in animal cells differ from mitosis in higher plant cells?

1. Plant cells divide by means of a cell plate 2. Animal cells undergo furrowing

Why is grafting used in agriculture?

1. Plants are uniform and more vigorous 2. Some plants may survive generations only by grafting 3. Size of plants is controlled by grafting 4. Valuable fruits and flowers can be grown on strong stock.

The two basic functions of meiosis are:

1. To maintain chromosome number through generation 2. Cause genetic variations by recombination

The nuclear envelope disintegrates during _________.

prophase.

Chromosomes are attached to the ___________________ during the metaphase of mitosis.

spindle fibers.

The area or kind of community that would have the highest portion of the species reproducing by asexual means is a __________.

tundra.

Each chromosome usually contains:

one gene for a particular trait.

The phase during mitosis when DNA separates into pairs of chromosomes is:

prophase.

Which method of asexual reproduction cannot occur in a unicellular organism?

regeneration.

Which group of organisms would produce conidia?

fungi.

The technique of growing plants in which a section of the stem is covered with soil and a partial cut is made between the parent plant and the buried part of the stem is called:

layering.

An adventurous bud would be formed on a _________.

root.

a successful scion (will/will not) produce the product of the rootstock with greater quality.

will not.

Chromatin or chromosomes are duplicated during:

S phase.

The chromosomes separate and move in opposite directions during:

anaphase.

Root cuttings (are/aren't) more commonly used than stem cuttings.

aren't.

Nearly all plants can reproduce _______.

asexually.

A protozoan that divides to form two daughter cells just like itself would be undergoing ______________.

binary fission.

The technique of asexual reproduction most commonly used in the production of fruit trees is _____.

budding.

A ________ is a plant structure with enlarged leaf bases containing stored food surrounding a central bit of fleshy, stem tissue.

bulb.

Which structure contains a great deal of leaf tissue?

bulb.

Why don't cyanobacteria and bacteria reproduce by mitosis?

they don't contain chromosomes.

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

double the original.

Matched pairs of chromosomes are called:

homologous.

The stock (is/isn't) inserted into the scion during grafting.

isn't.