20/1. Right or wrong?

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Are the following statements correct or incorrect?

1. Allelesa) Each individual has more than two different alleles for each gene.

b) The allele is a gene form.

c) Alleles are inherited from both parents.

d) Example: The formation of an earlobe is influenced by a gene. It has two gene forms, or alleles: One produces an attached earlobe, the other a free earlobe.


2. Dominant allelesa) The gene form of the dominant allele masks the effect of the recessive allele gene form.

b) The gene form of the recessive allele is never visible.


3. Characteristicsa) All the characteristics of an individual are inherited.

b) The living environment has no effect on an individual's characteristics.


4. Proteinsa) Proteins control the functions of genes.

b) Genes control the production of proteins.


5. Mutationsa) Mutations are always harmful.

b) In a chromosome mutation, one whole chromosome has been duplicated.


6. Hereditary diseasesa) More than one defective gene is required for an outbreak of a hereditary disease.

b) The outbreak of hereditary diseases cannot be influenced with individual actions.

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