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.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

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