Why is SRY considered to be a master gene? What will be an ideal response?
SRY is one of 78 genes found on the Y chromosome. It is responsible for the development of testes,
the products of which produce male secondary sexual characteristics. If the SRY gene is mutated, the
developing embryo will appear female and develop female sexual features.
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A cross where we follow the inheritance of 2 pairs of alleles is called
A. homozygous. B. monohybrid. C. dihybrid. D. heterozygous. E. diallelic.
When an environmental stimulus is received, the signal is usually transmitted through three types of nerves cells. In which order is the signal transmitted through these cells?
A. sensory neurons, motor neurons, interneurons B. motor neurons, sensory neurons, interneurons C. sensory neurons, interneurons, motor neurons D. interneurons, sensory neurons, motor neurons E. motor neurons, interneurons, sensory neurons
The sac which surrounds the heart is called the
A. endocardium. B. pericardium. C. atrium. D. myocardium
In which of the situations below would a plant be at greatest risk for the formation of air bubbles in the xylem stream?
A. during the night, when transpiration is low B. during the afternoon, when transpiration is highest C. in the early morning, with cooler temperatures and calm winds D. in the day during a drought E. the risk is the same at any time of day