From the list given below select the character which can be acquired but not inherited:
Colour of eye
Colour of skin
Size of body
Nature of hair
(3)
Environmental factors influence the development of acquired traits. It is because the availability of less or more food can modify the size of the body, it is an acquired feature. The other three—eye and skin colour, and nature of hair, are inherited characteristics from the parents.
What determines the differences between the progeny and parents?
Inheritance
Heritage
Genetics
Variation
(4)
Variation is the difference between individuals within a population. These arise between the progeny and parents/ancestors and form a backbone for natural selection to act on.
What branch of biology focuses on the study of patterns of inheritance?
Genetics
Immunology
Evolution
Ecology
(1)
Genetics is the branch of biology that deals with questions of inheritance. It uses techniques from various disciplines like Molecular biology, Cell biology, and many more to understand the basis of inheritance.
The phenomenon where individuals of a species exhibit differences in characteristics are called:
Adaptation
Evolution
Variation
All of these
(3)
Any difference between cells, individuals, or groups of organisms of any species produced by genetic differences (genotypic variation) or the effect of environmental conditions on the manifestation of genetic potentials is referred to as variation (phenotypic variation).
Which of the following statements is incorrect?
Gene is a sequence of nucleotides.
During the process of gene expression, DNA is first copied into RNA
Genes can acquire mutations in their sequence.
Genes cannot acquire mutations in their sequence.
(4)
Genes can acquire mutations. A gene mutation is a change in the DNA sequence that makes up a gene that is permanent and differs from the sequence found in most people.
When a new plant is formed as a result of cross-pollination from different varieties of a plant, the newly formed plant is called:
Dominant plant
Mutant plant
Hybrid plant
All of these
(3)
The process of crossing pollen from one flower to the pistils of another flower is known as cross-pollination. When a new plant is formed as a result of cross-pollination from different varieties of a plant, the newly formed plant is called hybrid plant.
Which of the following is an example of genetic variation?
One person has a scar but his friend does not.
One person is older than the other.
Reeta eats meat but her sister Geeta is a vegetarian.
Two children have different eye colour.
(4)
Variation in gene frequencies is referred to as genetic variation. Eye colour is determined by variations in genes of a person. Two children having different eye colour is an example of genetic variation.
Which of the following statements is true?
The characteristics or traits of parents are transmitted to their progeny (offspring) through genes present on their chromosomes during the process of sexual reproduction.
The genes which dominate other genes are called dominant genes and the genes which get dominated are called recessive genes.
The progeny inherits two genes for each trait from its parent but the traits shown by the progeny depends on which inherited gene is dominant of the two.
All of the above
(4)
Here, all the statements are correct. Hence, the answer will be option [D].
What, according to Mendel, was responsible for the inheritance of specific traits?
Genes
Factors
Chromosomes
DNA
(2)
Mendel discovered the laws of inheritance. He attributed these traits being encoded by factors. Later studies showed that these factors are genes.
The process where characteristics are transmitted from parent to offsprings is called:
Variation
Heredity
Gene
Allele
(2)
Characteristics from parents are passed down to offspring during sexual reproduction. These are the combinations of female and male parent. This is known as heredity.
