PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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hemophilia in Queen Victoria’s family
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widow’s peak in each generation of a family
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great variation in height seen in members of a family
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formation of freckles after sun exposure in members of a family
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Detailed explanation-1: -Gene expression can be altered by environmental factors such as food, drugs or exposure to toxins, according to Duke Magazine. These changes can range from small to so significant that certain genes in our system can be turned off or on when they are supposed to be the opposite way.
Detailed explanation-2: -Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal’s genes are expressed, which ultimately affects the animal’s phenotype.
Detailed explanation-3: -Sometimes the environment changes a gene-either its DNA sequence or its activity level. Either of these effects can change the proteins that are made from a gene, which in turn affects traits. Some harmful environmental factors can change a gene’s nucleotide sequence. For example, UV radiation can break DNA strands.
Detailed explanation-4: -Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.