15 Questions MCQ Test Science & Technology for UPSC CSE - Test: Heredity
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Fat biosynthesis occurs through metabolic reaction.
While genes do play a role in regulating metabolism and some aspects of fat storage, not every molecule of fat is directly linked to a specific gene. Fat molecules are primarily formed through metabolic reactions, which involve various biochemical processes in the body.
What is the role of genes in controlling characteristics or traits?
Detailed Solution for Test: Heredity - Question 2
Genes play a crucial role in controlling characteristics or traits of organisms by providing instructions for making specific proteins. Proteins are essential molecules that perform a wide range of functions in the body, including regulating growth, metabolism, and other processes that ultimately determine an organism's physical appearance, behavior, and other traits.
The traits which are expressed in first filial (F1) generation are known as which traits.
Detailed Solution for Test: Heredity - Question 3
One parent is homozygous for one allele, and the other parent is homozygous for the other allele. The offspring make up the first filial (F1) generation. Every member of the F1 generation is heterozygous and the phenotype of the F1 generation expresses the dominant trait.
The number of successful variations are maximized by the process of:
Detailed Solution for Test: Heredity - Question 4
The number of successful variations are maximised by the process of sexual reproduction. If we observe a field of sugarcane we find very little variations among the individual plants. But in a number of animals including human beings, which reproduce sexually, quite distinct variations are visible among different individuals.
The number of differences that appear in the new progeny in case of sexual reproduction is termed as ?
Detailed Solution for Test: Heredity - Question 8
"Variation" refers to the differences that appear among the offspring (progeny) of a sexually reproducing organism. When two parents with different genetic backgrounds contribute genetic material to create offspring, the resulting individuals can exhibit a wide range of traits and characteristics due to the combination of genes from both parents. This variation is essential for the process of evolution, as it provides the raw material upon which natural selection can act.
The normal number of chromosomes in the progeny is maintained when the germ cells:
Detailed Solution for Test: Heredity - Question 10
Each cell has two copies of chromosome one inherited from each mother and father. Every germ cell is taking one chromosome from each pair that may from either maternal origin or paternal. When these two germ cell combine, they restore the normal no. of the chromosome in the progeny maintaining the stability of DNA
Detailed Solution for Test: Heredity - Question 11
Explanation: Sexual reproduction involves the participation of two parents for the process of reproduction. During fertilization, the fusion of male and female gametes results in the creation of a zygote with a full set of chromosomes. This leads to the sharing of genetic information between the parents.
How do proteins control characteristics or traits in organisms?
Detailed Solution for Test: Heredity - Question 13
Explanation: Protiens can play a crucial role in controlling characteristics or traits in organisms and also can affect the efficiency of processes like hormone production, which, in turn, can impact the expression of traits.
From the options given below, select the character which can be acquired but not inherited?
Detailed Solution for Test: Heredity - Question 15
Since the size of body can vary person to person according to lifestyle and diet and is not same from generation to generation.For e.g., A fat boy can have a slim father or mother or both.
Skin complexion or skin color is an inherited characteristic. Hair is a trait that is passed down through generations so it is an inherited characteristic.
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