Differences between organisms in a species are described as variation. Which of the following would you describe as continuous variation?
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New species may be formed if
(i) Mating does not take place.
(ii) DNA undergoes significant changes in germ cells.
(iii) There is no change in genetic material.
(iv) Chromosome number changes in gametes.
The earlobe variants found in human population are
(i) Free
(ii) Curved
(iii) Round
(iv) Attached
Your mother bought carrot, potato, radish and brinjal. Which of them represent the correct homologus structures ?
Some dinosaurs had feathers but they could not fly but birds have feathers that help them to fly. In terms of evolution it means
How does sexual reproduction contribute to generating greater diversity in offspring?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Assertion (A): Variations in a species primarily arise due to asexual reproduction.
Reason (R): Sexual reproduction leads to significantly lesser diversity compared to asexual reproduction.
Accumulation of variation during reproduction:
(i) Asexual reproduction generates very minor differences due to small inaccuracies in DNA copying.
(ii) Sexual reproduction maximizes the number of successful variations.
(iii) All variations in a species have equal chances of surviving in the environment.
(iv) Inheritance from previous generations provides a common basic body design and subtle changes for the next generation.
The correct statements are :
Mendel proposed that two copies of factors controlling traits are present in sexually reproducing organisms, which are now called ______.
Assertion (A): In Mendel's experiments with pea plants, the first-generation (F1) progeny all exhibited the same trait, without any intermediate characteristics.
Reason (R): Mendel's observation of the F1 progeny led him to propose the presence of two copies of factors (genes) controlling traits in sexually reproducing organisms.
What determines a plant's height according to the provided explanation?
Traits like 'T' are called _____ traits, while those that behave like 't' are called _____ traits.
Assertion (A): In genetics, a heterozygous individual for a certain trait will always exhibit the dominant phenotype.
Reason (R): The dominant allele in a heterozygous genotype masks the expression of the recessive allele.
How are new combinations of traits formed in the F2 offspring according to Mendelian experiments?
How does the mechanism of heredity work? Cellular DNA is the information source for making ____ in the cell.
Assertion (A): New combinations of traits are formed in F2 offspring when factors controlling for seed shape and seed color recombine to form a zygote.
Reason (R): Tall/short trait and round seed/wrinkled seed trait are independently inherited.
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