Heredity and evolution Worksheet-1
Fill in the blanks:
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Gene is the part of a _____ which controls the appearance of a set of hereditary characteristics.
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_____ is the transmission of particular characteristics from generation to generation by means of the genetic code, which is transferred to offspring in the gametes.
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_____organs are those organs which have different basic structure and development origin but have similar appearance and perform similar functions.
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______ organs are those organs which have the same basic structural design and developmental origin but have different functions and appearance.
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Darwin explained _____ with the help of his theory of natural selection.
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______ refers to the transmission of characters or traits from the parents to their offspring.
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_____ refers to the differences in the characters or traits among the individuals of a species.
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_____ is the sequence of gradual changes which takes place in the primitive organisms over million of years in which new species are produced.
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_______ is the unit of inheritance.
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Human male produces _____of sperm and human female produces ______of ova.
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______ are the preserved remains, impressions or traces of organisms that lived in the past.
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_____ basis of sex determination is observed in most plants and animals.
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_____ is a type of social organisation in which individuals are ranked according to their status or dominance relative to other group members.
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______ is the arrangement of organisms into a series of groups based on physiological, biochemical, anatomical or other relationships.
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_____ is any change in the structure or functioning of an organism that makes it better suited to its environment.
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_____ is the evolutionary history of an organism or group of related organisms.
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______ is the evolution of reproductive isolation among once - interbreeding populations, i.e., the development of one or more species from an existing species.
Answer:
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Chromosome
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Inheritance
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Analogous
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Homologous
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Evolution
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Heredity
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Variation
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Evolution
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Gene
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Two types, one type
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Fossils
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Genetic
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Hierarchy
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Classification
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Adaptation
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Phylogeny
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Speciation