Question

Which statement is not correct?

Mutations change the sequence of nucleotides in DNA.

Mutations can be caused by mistakes made during the copying of DNA.

Mutations can be caused by toxic chemicals in the environment.

Mutations are not random.

Mutations can change the function of proteins.

Mutations are the basis for all of the genetic diversity that exists.

Which statement is not correct?

Chromosomes contain genes.

Chromosomes are made of DNA wrapped around protein.

Eukaryotes have many, linear chromosomes in their cells.

Different species can have a different number of chromosomes.

DNA is made by putting a string of amino acids together.

Which statement is not correct?

Cells with homologous chromosomes are diploid

Cells with homologous chromosomes are haploid

Gametes are haploid

Diploid cells have two sets of chromosomes in their nucleus.

Which is not a good example of alleles?

Brown hair and red hair, for the hair gene.

Stripes and no stripes, for a striped gene.

Ear lobe gene and freckles gene.

Straight nose and pug nose, for a nose gene.

Answer 1

1) A. Mutations are not random.

Mutation are changes that takes place in a cell or an organism which occurence is either related or not to how useful that mutation would be. Hence they are considered to be random.

2) E. DNA is made by putting a string of amino acids together.

DNA is a polymer made up of deoxyribonucleotide monomers. It doesn't have amino acid ( found in proteins) as it's building block. Hence it is incorrect.

3) B. cells with homologous chromosomes are haploid.

A cell is called diploid if it has two sets of chromosome which are homologous (2n). Haploid cell contains only one set of chromosome. Hence it is incorrect.

4) C. Ear lobes and freckle Gene.

These both are two different genes. Alleles are different forms of a single Gene. Hence it is incorrect.