Biology : Practice Questions and Answers

The chromosome numbers vary from organism to organism. Dogs have 78 chromosomes and cats have 38. The different pairings of chromosomes outlines the blueprints, which are the source of

A single gene is an uninterrupted segment of DNA, which contains coded instructions for the cell. Genes are located in the

Closely related species have the same genus name, but different species names. This makes for identification based on

Biotic and abiotic things interact within the same environment. An example of an abiotic part of an environment is

Although the same species may have the same basic structure, variations exist within the same species. Variations among members of a population are referred to as

This type of characteristic, eye color, is considered to be

To better understand variation; scientists explore the characteristics, which are passed on from generation to generation within a species. Those characteristics that are passed on from generation to generation are

Cross-fertilization occurs when a pollen grain

When a female cell (egg) is penetrated by a male cell (sperm) this occurs

The inherited material that is responsible for variation in all organisms is DNA, which stands for

All living cells contain DNA. In the cells of plants and mammals, DNA is located in the

A symbiotic relationship where one species benefits and the other species is harmed is called

When populations of different species live together within the same area, these populations form what is known as a

Suckers (which are miniature identical forms of the parent plant) can be formed in the roots of poplar trees. Each of these suckers can produce trees identical to the parenttree. This form of asexual reproduction is called

When a plant cutting produces a new individual, it does so without the formation of a seed. This type of asexual reproduction is called

There are different forms of reproduction in organisms. Asexual reproduction involves only one parent. A hydra reproduces asexually when it produces a smaller version of itself by

The five-kingdom classification system used by scientists includes:

Offspring inherit genes from both parents. Most genes in most species exist in an array of possible forms known as

Your height is considered to be a heritable characteristic, but is affected by

In organisms such as plants and animals, the chromosomes are located in the nucleus. Each human nucleus has this many chromosomes