[CBSE 2012, 2008, 2016, 2017], What are acquired traits? [CBSE 2014], (a) Give the evidence that the birds have evolved from reptiles. (a) Fossils are important evolutionary evidence to show what kind of organisms existed earlier. Factors responsible for speciation are: (i) Natural selection- Nature select due to survival advantages. (iii) How many types of gametes can a male fly produce? While making groups, we need to decide the characteristics that are responsible for the more fundamental differences among organisms. [CBSE 2012, 2016, 2017], Give two uses of fossils. And helpfull just like my teacher, very good site and really helpful Thus, Archaeopteryx is considered a connecting link between reptiles and birds. Thus over a period of time only green beetles grow in number as their rate of survival will be higher and red beetles with decreasing population will be under threat. Each chromosome is double or replicated and consists of two thread like structures called chromatids attached to each other at centro mere. DNA. Birds seem to have later used feathers to fly. Q.77 Insects, octopus, planaria and vertebrates possess eyes. We use ours for chewing while elephants use theirs to hold things. Reproductive isolated is a collection of behavior, mechanism and physiological process they prevent the member of two different species which cross or mate from producing offspring or which ensure that may be produce is not fertile. (iii) Variations : The useful variations help the individuals to adopt the environmental condition, (iv) Genetic Drift : The random change in the frequency of alleles in a population over successive generations due to error during DNA copying on the gametes. (c) What for did Mendel use the term factors and what are these factors called now. Vedantu Biology Master Teacher Amrit Sir sir takes you through the Guaranteed 5 Marks Questions of Heredity and Evolution Chapter. An example of homologous organs is [NCERT] (a) our arm and a dog’s foreleg (b) our teeth and an elephant’s tusks (c) potato and runners of grass (d) All of the above. •   In a lizard, Agama agama, high incubation temperature results into development of a male. [CBSE 2012, 2013, 2016, 2017], Describe any three methods of tracing evolutionary relationships amongst organisms. Organisation of the body(cell design), whether it is unicellular or multicellular. (c) Sterile flowers- Cauliflowers. Where are the genes located? (b) To know past climatic conditions. Fossil provide evidence for evolution as they are preserved traces of living organisms. Give reason to support your answer. DNA is the basic source of making proteins in the cells. Just on the basis of one characteristic, i.e., presence of eyes, these organisms cannot be grouped together. (iii) Fossils- These are imprints or dead remains of plants and animals. So we can safely say that evolution cannot be equate with progress. Birds developed features, as they evolved to become warm blooded animals to protect them from cold. Heredity is very evidently seen in sexual reproduction. Analogous organs indicate that even the organisms having different structures can adapt to perform similar functions for their survival under given similar environmental conditions. Dominant traits refers for the alternative of a character that expresses itself in the F1 generation. The way the organs of the body develop and become specialised. This cross shows that females produce all similar gametes, carrying X chromosome. This pair is XX in females and XY in males. Why does environmentalist get worried due to small population of a species? var day = ("0" + now.getDate()).slice(-2); There are 2 types of sex chromosomes- the X- chromosome and the Y- chromosome. (iv) Some farmers selected the swollen part of the wild cabbage and developed the kohlrabi. Mendel proposed that for regulation of every character (in an organism) there is a pair of factors. var month = ("0" + (now.getMonth() + 1)).slice(-2); Q.6 Variation useful for the survival of a species. Really grateful for u always, The questions are very good All Chapter 9 - Heredity and Evolution Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. Beetles would be naturally selected, and will grow in a species selected immature green flowers and heredity and evolution one mark questions broccoli... Fewer than the number of chromosomes to that of somatic cells parent are not present on genes. All of them survive female parent fly inherit X chromosome from his mother.! And XY in males are XY and XX known as variation ancestors left Africa search... Chapter-9 Heredity and evolution Multiple Choice questions with Answers to know their preparation.... 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