Which of the following statements about genes is incorrect? a. during fertilization, both the sperm and the ovum contribute genes to the resulting fertilized egg. b. many genes contain the information needed for cells to synthesize enzymes and other proteins. c. genes correspond to segments of dna. d. under normal circumstances, each chromosome contains precisely one gene. e. genetic differences can result from changes in the dna called mutations.

d. Under normal circumstances, each chromosome contains precisely one gene.

Explanation:

The gene is a segment of a DNA molecule, responsible for genetically inherited traits. Each gene consists of a specific DNA sequence that contains a code (instructions) to produce a protein that performs a specific function in the body. Each human cell has about 25,000 genes.

The genes are located within the chromosomes. A chromosome can house thousands of genes, it is not normal for a chromosome to house a gene or a few units. Thus, if a cell contains 46 chromosomes, that cell has an incalculable number of genes.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

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