Explain Environmental Influences on Traits - Biology
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Which environmental condition can trigger increased red blood cell production in humans?
Which environmental condition can trigger increased red blood cell production in humans?
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Low oxygen at high altitude. Body compensates for reduced oxygen availability.
Low oxygen at high altitude. Body compensates for reduced oxygen availability.
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What term describes the genetic makeup that can influence traits?
What term describes the genetic makeup that can influence traits?
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Genotype. The complete set of genes an organism inherits.
Genotype. The complete set of genes an organism inherits.
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Which term describes how different genotypes respond differently to the same environment?
Which term describes how different genotypes respond differently to the same environment?
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Genotype-by-environment interaction (G×E). Different genetic variants respond uniquely to conditions.
Genotype-by-environment interaction (G×E). Different genetic variants respond uniquely to conditions.
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Which nutrient deficiency is most directly linked to reduced hemoglobin production?
Which nutrient deficiency is most directly linked to reduced hemoglobin production?
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Iron deficiency. Iron is essential for hemoglobin synthesis.
Iron deficiency. Iron is essential for hemoglobin synthesis.
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What is the definition of gene expression?
What is the definition of gene expression?
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Use of genetic information to make RNA and proteins. Process of turning genes into functional products.
Use of genetic information to make RNA and proteins. Process of turning genes into functional products.
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Identify the correct conclusion: two plants with the same genotype differ in height in sun vs shade.
Identify the correct conclusion: two plants with the same genotype differ in height in sun vs shade.
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Environment influenced phenotype (phenotypic plasticity). Same genotype responds differently to light conditions.
Environment influenced phenotype (phenotypic plasticity). Same genotype responds differently to light conditions.
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What is acclimation?
What is acclimation?
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Reversible phenotypic adjustment to environmental change. Short-term adjustment to environmental changes.
Reversible phenotypic adjustment to environmental change. Short-term adjustment to environmental changes.
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Which environmental factor most directly affects stomatal opening in many plants?
Which environmental factor most directly affects stomatal opening in many plants?
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Water availability (drought) and humidity. Water stress triggers stomatal closure responses.
Water availability (drought) and humidity. Water stress triggers stomatal closure responses.
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Which pigment allows plants to detect day length for photoperiod responses?
Which pigment allows plants to detect day length for photoperiod responses?
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Phytochrome. Light-sensitive protein that measures day length.
Phytochrome. Light-sensitive protein that measures day length.
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What is photoperiodism?
What is photoperiodism?
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Physiological response to day length. Plants use day length to time seasonal responses.
Physiological response to day length. Plants use day length to time seasonal responses.
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Which environmental factor can change plant growth form by altering gene expression patterns?
Which environmental factor can change plant growth form by altering gene expression patterns?
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Light conditions (intensity and photoperiod). Light quality and duration regulate plant development.
Light conditions (intensity and photoperiod). Light quality and duration regulate plant development.
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Which infectious agent in pregnancy can cause congenital defects and hearing loss?
Which infectious agent in pregnancy can cause congenital defects and hearing loss?
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Rubella virus. Viral infection during pregnancy affects development.
Rubella virus. Viral infection during pregnancy affects development.
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Which teratogen is strongly associated with fetal alcohol spectrum disorders?
Which teratogen is strongly associated with fetal alcohol spectrum disorders?
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Alcohol (ethanol). Crosses placenta and damages developing brain tissue.
Alcohol (ethanol). Crosses placenta and damages developing brain tissue.
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What is the definition of a teratogen?
What is the definition of a teratogen?
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An environmental agent that disrupts embryonic development. Chemical or physical factor causing birth defects.
An environmental agent that disrupts embryonic development. Chemical or physical factor causing birth defects.
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Which human trait is a classic example of multifactorial inheritance with environmental effects?
Which human trait is a classic example of multifactorial inheritance with environmental effects?
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Body mass (weight) or height. Many genes and nutrition both influence these traits.
Body mass (weight) or height. Many genes and nutrition both influence these traits.
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What is the name of the trait pattern where many genes and environment both influence outcome?
What is the name of the trait pattern where many genes and environment both influence outcome?
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Multifactorial trait. Multiple genes plus environment create complex patterns.
Multifactorial trait. Multiple genes plus environment create complex patterns.
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Which nutrient deficiency is most directly linked to reduced hemoglobin production?
Which nutrient deficiency is most directly linked to reduced hemoglobin production?
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Iron deficiency. Iron is essential for hemoglobin synthesis.
Iron deficiency. Iron is essential for hemoglobin synthesis.
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Which environmental factor during development can reduce adult height even with tall-parent genes?
Which environmental factor during development can reduce adult height even with tall-parent genes?
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Poor nutrition (especially protein and calories). Malnutrition limits growth despite genetic potential.
Poor nutrition (especially protein and calories). Malnutrition limits growth despite genetic potential.
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Which environmental factor most directly increases muscle size in a trained person?
Which environmental factor most directly increases muscle size in a trained person?
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Exercise (mechanical load and training). Resistance training stimulates muscle protein synthesis.
Exercise (mechanical load and training). Resistance training stimulates muscle protein synthesis.
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What pigment increases in human skin in response to UV exposure?
What pigment increases in human skin in response to UV exposure?
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Melanin. Dark pigment that protects skin from UV damage.
Melanin. Dark pigment that protects skin from UV damage.
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Which environmental factor is most directly linked to tanning in humans?
Which environmental factor is most directly linked to tanning in humans?
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Ultraviolet (UV) radiation exposure. UV light triggers melanin production as protection.
Ultraviolet (UV) radiation exposure. UV light triggers melanin production as protection.
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Which epigenetic change commonly reduces gene expression by tightening DNA packing?
Which epigenetic change commonly reduces gene expression by tightening DNA packing?
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DNA methylation. Chemical modification that silences gene transcription.
DNA methylation. Chemical modification that silences gene transcription.
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What is epigenetics?
What is epigenetics?
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Heritable changes in gene expression without DNA sequence change. Gene activity changes without altering DNA sequence.
Heritable changes in gene expression without DNA sequence change. Gene activity changes without altering DNA sequence.
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What is the primary reason identical twins can show different phenotypes?
What is the primary reason identical twins can show different phenotypes?
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Different environments and epigenetic differences. Environment and gene regulation vary even with same DNA.
Different environments and epigenetic differences. Environment and gene regulation vary even with same DNA.
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Which statement is correct: acquired characteristics are inherited or not inherited?
Which statement is correct: acquired characteristics are inherited or not inherited?
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Not inherited (they do not change DNA sequence in gametes). Only changes in gamete DNA are passed to offspring.
Not inherited (they do not change DNA sequence in gametes). Only changes in gamete DNA are passed to offspring.
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What is the definition of an acquired characteristic?
What is the definition of an acquired characteristic?
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A trait change due to environment, not inherited genetically. Traits gained during life, not passed to offspring.
A trait change due to environment, not inherited genetically. Traits gained during life, not passed to offspring.
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Which term describes traits strongly influenced by environment, making them vary continuously?
Which term describes traits strongly influenced by environment, making them vary continuously?
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Quantitative traits. Continuous variation due to environmental sensitivity.
Quantitative traits. Continuous variation due to environmental sensitivity.
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Which option best describes why PKU requires a special diet despite being genetic?
Which option best describes why PKU requires a special diet despite being genetic?
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Dietary phenylalanine level affects symptom development. Restricting substrate prevents toxic metabolite buildup.
Dietary phenylalanine level affects symptom development. Restricting substrate prevents toxic metabolite buildup.
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Which environmental factor most directly influences the severity of lactose intolerance symptoms?
Which environmental factor most directly influences the severity of lactose intolerance symptoms?
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Amount of lactose consumed (diet). Symptom severity depends on dietary intake.
Amount of lactose consumed (diet). Symptom severity depends on dietary intake.
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What is the definition of an environmental influence on a trait?
What is the definition of an environmental influence on a trait?
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A non-genetic factor that affects phenotype expression. External conditions that modify how genes are expressed.
A non-genetic factor that affects phenotype expression. External conditions that modify how genes are expressed.
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