Q1
What carries hereditary information?
AGenes on chromosomes
BOnly blood
COnly skin cells
DNothing carries it
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 16 · Topic 1
Heredity and Variation
Heredity is the passing of traits from parents to offspring, while variation refers to differences among individuals, both driving biologica
Core concept
Genes, located on chromosomes, carry hereditary information passed from parents to offspring, determining various inherited traits.
How it works
Mendel's laws of inheritance explain how traits are passed down, including dominant and recessive alleles determining observable characteristics.
Why it matters
Variation occurs due to genetic differences (mutations, genetic recombination) and environmental influences on individuals within a species.
Key detail
Heredity and variation together drive evolution, as advantageous variations can be naturally selected and passed to future generations.
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• Genes on chromosomes carry hereditary info.
• Passed from parents to offspring.
• Mendel's laws: dominant, recessive alleles.
• These determine observable characteristics.
• Variation: genetic differences, mutations.
• Also environmental influences matter.
• Heredity, variation drive evolution.
• Advantageous variations naturally selected.