3.1 Genes Questionbank

They are the different forms of a gene that have the same effect on the phenotype.

They are the similar forms of a gene in different positions of a chromosome.

They are the various forms of a gene with slight differences in their base sequences.

They are the different forms of a gene coding for identical polypeptide chains.

The DNA in all organisms is circular.

DNA in E. coli naturally contains thymidine.

DNA replication is conservative.

The DNA in E. coli is 900 μm in length.

Their positions on homologous chromosomes

Their amino acid sequence

The characteristic they influence

Their base sequence

Change of genetic code in the same species

Transfer of genes between species

Formation of clones

Infection by bacteria

3

6

9

12

The human genome is larger than the E. coli genome.

There are more genes on each human chromosome than on the E. coli chromosome.

The human cell and the E. coli cell produce approximately the same variety of proteins.

The DNA in both organisms is associated with histones (proteins).

The whole of the genetic information of an organism

The factor that affects the phenotype in the homozygous state

A heritable factor that controls a specific characteristic

The factor that affects the phenotype in the heterozygous state

50

200

800

1000

An allele is made of RNA.

An allele is shorter.

An allele is a variety of a gene.

An allele cannot be transferred during genetic modification.