Heredity and Variation
Heredity and Variation: Overview
This topic covers concepts, such as Genetics, Heredity, Variation, Gene, Alleles, Dominant Trait, Recessive Trait, and Mendel's Laws of Inheritance.
Important Questions on Heredity and Variation
Which of the following law of inheritance has not been given by Mendel:
A homozygous tall pea plant with yellow seeds is crossed with a dwarf pea plant with green seeds. The phenotypic ratio of its F2 plants would be:
Assertion: Excessive use of pesticides and herbicides has no effect on resistant varieties of microbes.
Reason: Pathogenic bacteria are appearing in a very short period of time because of chemical resistance.
Usually the number of alleles of a gene are-
Expression of recessive allele occurs in
Genes which code for a pair of contrasting traits are known as
Mendel selected two types of flower colour for his hybridisation experiments, one is purple and another one is white or green?
Garden pea plant is a cross-pollinating plant.
Garden pea is an_____ plant and completes the life cycle within three to four months(one season).
What is the scientific name of the pea plant?
Garden pea plant is a cross-pollinating plant.
Garden pea is an _____(annual/woody) plant and completes the life cycle within three to four months (one season).
Fill in the blank with the correct word given in the bracket.
Mendel selected two types of flower colour for his hybridisation experiments, one is purple and another one is _____ (white/black).
What is the scientific name of the plant that Mendel used for his experiment?
Atavism is the phenomenon in which a genotype reappears in an organism.
What is the scientific name of the plant that Mendel used for his experiment?
If a person has green eyes like her great-great-grandmother but her mother, grandmother, and great-grandmother have brown eyes, then having green eyes is an example of?
Choose the wrong statement.
A. A single gene product may produce more than one effect thus it relates to pleiotropy
B. Dominance is an autonomous feature of a gene or the product
C. The frequency of recombination between gene pairs on the same chromosome as a measure of distance between those genes
D. Breeder cannot select the mutations of the desirable types as it has less variability
The correct answer is
Arrange the discoveries in ascending chronological order.
A. Discovery of citric acid cycle
B. Discovery of cell
C. Laws of inheritance
D. Book on agriculture and weeds
E. Discovery of genetic nature of
F. Description and identification of plants
Choose the correct statements.
A. A single gene may be related to more than one character is called pleiotropy.
B. A non-functional allele can be considered as dominant allele when an unmodified gene is called recessive trait.
C. Genes which code for a pair of contrasting traits are known as alleles.
D. Sahiwal cows of Punjab are the example for selection.
