science
Grade-10
Easy
Question
Which of these is an example of inherited variation only?
- Eye color
- Height
- Weight
- Skin color
Hint:
Trait is an example of discontinuous variation.
The correct answer is: Eye color
Eye color is due to the amount of melanin pigment production. Initially, brown color was considered dominant and blue color was considered recessive. Hence, it was believed that parents with blue eye color produced offspring with blue colored eyes. Later, this hypothesis was proved wrong.
The melanin production for eye is controlled by OCR2 gene present in chromosome 15. The expression of this gene is controlled by HERC2 gene. Increased expression of ORC2 gene produces melanin and the progeny will have brown eyes. Decreased expression of the gene due to inhibitory action of HERC2 gene reduces melanin production, thereby progeny has blue eyes.
The genes responsible for the production of melanin is inherited from the parents. Hence, the eye color is an inherited trait.
- Eye color is due to the expression of 2 genes: ORC2 and HERC2
- Increased and decreased expression of the genes produce brown eyed and blue eyed offspring, respectively
Related Questions to study
science
A length of DNA that codes for a specific characteristic
- Functional unit if hereditary is called gene
- Gene codes for specific proteins
- Genes are located at locus
- Alteration in the sequence of DNA is called mutation
A length of DNA that codes for a specific characteristic
scienceGrade-10
- Functional unit if hereditary is called gene
- Gene codes for specific proteins
- Genes are located at locus
- Alteration in the sequence of DNA is called mutation
science
Differences that exist naturally among members of a population or species are called ___?
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
Differences that exist naturally among members of a population or species are called ___?
scienceGrade-10
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
science
The ability to recognize a predator is an example of a ______adaptation?
The ability to recognize a predator is an example of a ______adaptation?
scienceGrade-10
science
Most adaptations that help an organism survive are passed on from parent to child as ___traits?
- Genetic information is stored in DNA present in the nucleus of the cells
- Genetic information can be passed from parent to offspring which is termed as inheritance
Most adaptations that help an organism survive are passed on from parent to child as ___traits?
scienceGrade-10
- Genetic information is stored in DNA present in the nucleus of the cells
- Genetic information can be passed from parent to offspring which is termed as inheritance
science
An organism that survives longer is more likely to produce_______offspring
- Individuals lacking fitness either does not attain mature age or fail to reproduce healthy offspring
An organism that survives longer is more likely to produce_______offspring
scienceGrade-10
- Individuals lacking fitness either does not attain mature age or fail to reproduce healthy offspring
science
Which one of the following shows continuous variation?
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
- Continuous variation of a trait is not limited to a specific number as in height or weight of individuals in a group
Which one of the following shows continuous variation?
scienceGrade-10
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
- Continuous variation of a trait is not limited to a specific number as in height or weight of individuals in a group
science
Which one of the following shows discontinuous variation?
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
- Discontinuous variation of a trait is limited to specific number as in eye color or blood groups
Which one of the following shows discontinuous variation?
scienceGrade-10
- Genetic variation is the reason for difference among individuals within the same species
- Variations can be continuous or discontinuous
- Discontinuous variation of a trait is limited to specific number as in eye color or blood groups
science
The variety of genes and alleles that exist in organisms.
- Genetic diversity refers to difference in genetic make up among individuals of the same species
- Genetic diversity decides the fate of survival of the individual
- Different breeds of animals, birds are few examples of genetic diversity
- Independent assortment represents the separation of genes during meiosis
The variety of genes and alleles that exist in organisms.
scienceGrade-10
- Genetic diversity refers to difference in genetic make up among individuals of the same species
- Genetic diversity decides the fate of survival of the individual
- Different breeds of animals, birds are few examples of genetic diversity
- Independent assortment represents the separation of genes during meiosis
science
_____________ is the transfer of characters from parents to offspring.
_____________ is the transfer of characters from parents to offspring.
scienceGrade-10
science
Mitosis is also known as _________________.
Mitosis is also known as _________________.
scienceGrade-10
science
Genetic variation is not caused by:
Genetic variation is not caused by:
scienceGrade-10
science
Crossing over occurs in which phase?
Crossing over occurs in which phase?
scienceGrade-10
science
If a diploid cell with a diploid number of 36 chromosomes undergoes meiosis. How many chromosomes are present in each daughter cell after division?
If a diploid cell with a diploid number of 36 chromosomes undergoes meiosis. How many chromosomes are present in each daughter cell after division?
scienceGrade-10
science
What is the significance of crossing over?
What is the significance of crossing over?
scienceGrade-10
science
____________ type of cell division takes place in gametes.
____________ type of cell division takes place in gametes.
scienceGrade-10
