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Tissues Vet Science Terms Types of Reproduction Regulation of Heart Rate History of Psychology Immunity and Vaccines Vascular Surgery Facial & Dental Injuries Careers in Health Care Pain Management Gaseous Exchange in Humans Year 7 Nutrition Bone Shapes & Long Bone Anatomy Major Internal Organs of the Body HFT Vitamins Nucleic Acids

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Genetics › View

Most genes have many more than two alleles. However, which of the following is also true?

A. At least one allele for a gene always produces a dominant phenotype.

B. There may still be only two phenotypes for the trait.

C. All of the alleles but one will produce harmful effects if homozygous

D. Most of the alleles will never be found in a live-born organism.

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Muscle Anatomy › View

According to the sliding filament theory, how does muscle contraction occur?

A. Both thick and thin filaments shorten as the muscle contracts.

B. Myosin heads attach and detach from thin filaments, causing thin filaments to shorten.

C. A bands bunch up and shorten as myosin heads attach to thin filaments.

D. Myosin cross bridges pull thin filaments, causing them to slide.

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