Read the passage given below and answer the following questions from (i) to (v):
Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed self-pollination and cross-pollination to understand the inheritance patterns of traits.
(i) After cross-fertilisation of true-breeding tall and dwarf plants, the generation was self-fertilised. The resultant plants have genotype in the ratio:
1:2:1 (homozygous tall: heterozygous tall: dwarf)
1:2:1 (heterozygous tall: homozygous tall: dwarf)
3:1 (tall: dwarf)
3:1 (dwarf: tall)
(1)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed self-pollination and cross-pollination to understand the inheritance patterns of traits.
(ii) Which of the following characteristics of pea plants was not used by Mendel in his experiments?
Seed colour
Seed shape
Pod length
Flower position
(3)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed self-pollination and cross-pollination to understand the inheritance patterns of traits.
(iii) Mendel took ______ contrasting characteristics of pea plants.
eight
seven
six
five
(2)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed self-pollination and cross-pollination to understand the inheritance patterns of traits.
(iv) The maleness of a child is determined by:
the X-chromosome in the zygote
the Y-chromosome in zygote
the cytoplasm of germ cell which determines the sex
sex is determined by chance
(2)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Johann Mendel is known as a “Father of modern genetics” for his work in the field of genetics. He gave three laws of inheritance followed as Law of dominance, Law of segregation and Law of independent assortment. He conducted his experiment on garden pea plants having contrasting characteristics. He performed self-pollination and cross-pollination to understand the inheritance patterns of traits.
(v) Test cross determines:
whether two traits are linked or not
the genotype of plant
whether the two species will breed successfully or not
number of alleles in a gene
(2)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Mendel, in 1865, paved the way for the analysis of the underlying genetic basis of traits by setting out to understand the principles of heredity. As per Darwin’s observations, in nearly all populations individuals tend to produce far more offspring than are needed to replace the parents. He also observed that it is very rare for any two individuals to be exactly alike. All the natural variations among individuals lead to natural selection. Individuals born with variations that present an advantage in obtaining resources or mates have greater chances of living and reproducing offspring who would inherit and carry forward the favourable variations. At the same time, individuals with different variations might be less likely to reproduce.
(i) VV, Vv and vv are ______ while violet and white are ______.
genotypes, phenotypes
phenotypes, genotypes
genotypes, genotypes
phenotypes, phenotypes
(1)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Mendel, in 1865, paved the way for the analysis of the underlying genetic basis of traits by setting out to understand the principles of heredity. As per Darwin’s observations, in nearly all populations individuals tend to produce far more offspring than are needed to replace the parents. He also observed that it is very rare for any two individuals to be exactly alike. All the natural variations among individuals lead to natural selection. Individuals born with variations that present an advantage in obtaining resources or mates have greater chances of living and reproducing offspring who would inherit and carry forward the favourable variations. At the same time, individuals with different variations might be less likely to reproduce.
(ii) Which one of the following traits is most likely to pass from one generation to other?
Artificial hair coloured by a mother during pregnancy
Acquired skills by a father
Brown eye colour
Six fingers in right hand of a person
(3)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Mendel, in 1865, paved the way for the analysis of the underlying genetic basis of traits by setting out to understand the principles of heredity. As per Darwin’s observations, in nearly all populations individuals tend to produce far more offspring than are needed to replace the parents. He also observed that it is very rare for any two individuals to be exactly alike. All the natural variations among individuals lead to natural selection. Individuals born with variations that present an advantage in obtaining resources or mates have greater chances of living and reproducing offspring who would inherit and carry forward the favourable variations. At the same time, individuals with different variations might be less likely to reproduce.
(iii) ______ is simply the generation of diversity and the shaping of the diversity by environmental selection.
Evolution
Speciation
Heredity
Natural selection
(1)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Mendel, in 1865, paved the way for the analysis of the underlying genetic basis of traits by setting out to understand the principles of heredity. As per Darwin’s observations, in nearly all populations individuals tend to produce far more offspring than are needed to replace the parents. He also observed that it is very rare for any two individuals to be exactly alike. All the natural variations among individuals lead to natural selection. Individuals born with variations that present an advantage in obtaining resources or mates have greater chances of living and reproducing offspring who would inherit and carry forward the favourable variations. At the same time, individuals with different variations might be less likely to reproduce.
(iv) Which one of the following statements is not true?
Excavating, time-dating, studying fossils, and determining DNA sequences are tools to study evolution.
Variations arising during the process of reproduction cannot be inherited.
Variations in the species may confer survival advantages or merely contribute to the genetic drift.
Classification of organisms is based on tracing evolutionary relationships.
(2)
Read the passage given below and answer the following questions from (i) to (v):
Gregor Mendel, in 1865, paved the way for the analysis of the underlying genetic basis of traits by setting out to understand the principles of heredity. As per Darwin’s observations, in nearly all populations individuals tend to produce far more offspring than are needed to replace the parents. He also observed that it is very rare for any two individuals to be exactly alike. All the natural variations among individuals lead to natural selection. Individuals born with variations that present an advantage in obtaining resources or mates have greater chances of living and reproducing offspring who would inherit and carry forward the favourable variations. At the same time, individuals with different variations might be less likely to reproduce.
(v) Frequency of certain ______ in a population changes over generations to bring about evolution.
members
progenies
genes
ideas
(3)
