science
Grade-10
Easy

Question

An allele is considered as:

  1. A homozygous genotype

  2. A heterozygous genotype

  3. Several possible forms of a gene

  4. Another word for a gene

hintHint:

Variants of a particular gene are observed in nature.

The correct answer is:

Several possible forms of a gene


    • An allele refers to DNA sequences present in a particular locus
    • The allele is the different versions or variants that are possible for a specific gene
    • Eye color is a gene while the variants found in eye color (like blue eyes, brown eyes) are due to alleles
    • For a particular gene two alleles are present
    • The allele is expressed as the phenotype
    • Usually the dominant allele will be expressed

    • Alleles are sequence of nucleic acid that determine the phenotype of an organism

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    In sexual reproduction ______ gametes fuse to form _________ zygote.

    • Living organisms contain two types of cells: somatic cells and sex cells
    • The somatic or body cells contain two sets of chromosomes and are called diploid
    • The gametes contain single set of chromosomes and are called haploid

    In sexual reproduction ______ gametes fuse to form _________ zygote.

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    • Living organisms contain two types of cells: somatic cells and sex cells
    • The somatic or body cells contain two sets of chromosomes and are called diploid
    • The gametes contain single set of chromosomes and are called haploid

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    Genotype is referred to as the_________________

    • Genotype of an individual is a combination of genes received from both parents
    • The offspring will exert the characteristics of the dominant alone, though the genotype contains both dominant and recessive alleles

    Genotype is referred to as the_________________

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    • Genotype of an individual is a combination of genes received from both parents
    • The offspring will exert the characteristics of the dominant alone, though the genotype contains both dominant and recessive alleles

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    If a cross between homozygous tall (TT) and homozygous dwarf pea plant (tt) is carried out then, the offspring of the F1 generation will be:   

    • Monohybrid cross between TT vs tt is as follows:
    GametesTT
    tTtTt
    tTtTt
    • Tt is heterozygous and represents tall offspring

    If a cross between homozygous tall (TT) and homozygous dwarf pea plant (tt) is carried out then, the offspring of the F1 generation will be:   

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    • Monohybrid cross between TT vs tt is as follows:
    GametesTT
    tTtTt
    tTtTt
    • Tt is heterozygous and represents tall offspring

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    Which branch of biology focuses on the study of inheritance?

    • Inheritance is the transmission of genes down to future generations
    • Laws of inheritance were proposed by Mendel
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    • The gene is the hereditary unit 
    • The physical traits are due to the expression of genes

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    • Inheritance is the transmission of genes down to future generations
    • Laws of inheritance were proposed by Mendel
    • Laws of inheritance include: Law of dominance, Law of segregation and Law of independent assortment
    • The gene is the hereditary unit 
    • The physical traits are due to the expression of genes

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    Phenotype means the ______________________ of an individual.

    • Behavior is also included in phenotype
    • Phenotype can be subjected to change
    • Alteration of phenotype to survive extreme condition is the basis for evolution

    Phenotype means the ______________________ of an individual.

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    • Behavior is also included in phenotype
    • Phenotype can be subjected to change
    • Alteration of phenotype to survive extreme condition is the basis for evolution

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    Which among the following is a recessive trait in pea plants?

    • The homozygous trait for violet flower is PP and for white flower is pp
    • A cross between these two flowers produced Pp which is heterozygous
    • The hybrid formed exhibited dominant allele purple color, which will mask the recessive allele expression

    Which among the following is a recessive trait in pea plants?

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    • The homozygous trait for violet flower is PP and for white flower is pp
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    Mendel believed that characteristics of pea plants are determined by the:

    • Genes have two alleles: a dominant and recessive
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    Mendel believed that characteristics of pea plants are determined by the:

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    • Genes have two alleles: a dominant and recessive
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    Mendel used __________ type of pea lines.

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    • Self pollinating flowers are produced when pollen fall from anther to the stigma of the same plant
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    The idea that different alleles pairs are passed to offspring independently of each other is Mendel's law of:

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    • The assortment of the chromosomes into gametes occur randomly
    • Following segregation, recombination also occurs during meiosis
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    The idea that different alleles pairs are passed to offspring independently of each other is Mendel's law of:

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    • The law of segregation is the basis for independent assortment
    • During meiosis, the number of chromosomes is reduced to half to form haploid gametes
    • The assortment of the chromosomes into gametes occur randomly
    • Following segregation, recombination also occurs during meiosis
    • Combination of paternal and maternal genes can occur and a hybrid is formed

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    The genotypic ratio of monohybrid cross is?

    • Monohybrid cross is the cross between parents with homozygous genotype of a single trait
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    • The dominant allele can be determined
    • Punnett square can be used to determine the phenotype and genotype 

    The genotypic ratio of monohybrid cross is?

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    • Monohybrid cross is the cross between parents with homozygous genotype of a single trait
    • Genotype of homozygous individuals cane be determined through monohybrid cross
    • The dominant allele can be determined
    • Punnett square can be used to determine the phenotype and genotype 

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    Continuous self-pollination in a species may develop?

    • Pollination helps in the reproduction in plants by transfer of pollen grains from anther to stigma
    • Pollination can be classified into 
    1. Self pollination: Pollen grains from anther falls into the stigma of the same flower
    2. Cross pollination: Pollen grains from anther falls into the stigma of a different flower

    Continuous self-pollination in a species may develop?

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    • Pollination helps in the reproduction in plants by transfer of pollen grains from anther to stigma
    • Pollination can be classified into 
    1. Self pollination: Pollen grains from anther falls into the stigma of the same flower
    2. Cross pollination: Pollen grains from anther falls into the stigma of a different flower

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    Which method is used to produce a true-breeding line?  

    • True or pure breeding is possible in self-pollination
    • Elimination of weaker qualities is not possible
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    Which method is used to produce a true-breeding line?  

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    • True or pure breeding is possible in self-pollination
    • Elimination of weaker qualities is not possible
    • New variety of offspring cannot be formed in self-pollinating plants

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    The process of the transfer of characters from parents to offspring is referred to as ______

    • The genes are present in chromosomes
    • Each organism has a specific number of chromosome
    • Humans have 23 pairs while peas have 7 pairs

    The process of the transfer of characters from parents to offspring is referred to as ______

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    • The genes are present in chromosomes
    • Each organism has a specific number of chromosome
    • Humans have 23 pairs while peas have 7 pairs

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    Which is not a pair of contrasting traits studied by Mendel?

    • Gene is the hereditary unit
    • Gene can have different versions called alleles
    • The alleles can be dominant or recessive
    • The presence of a dominant allele will mask the presence of a recessive allele

    Which is not a pair of contrasting traits studied by Mendel?

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    • Gene is the hereditary unit
    • Gene can have different versions called alleles
    • The alleles can be dominant or recessive
    • The presence of a dominant allele will mask the presence of a recessive allele

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    Mendel’s idea that the pair of alleles of each parent separate and only one allele from each parent is passed to an offspring is explained by:

    • Law of segregation is the second law of inheritance
    • Law of inheritance is based on the following:
    1. Gene can exist in various versions called alleles
    2. During meiosis, separation of allelic pair occurs providing single allele to each gamete
    3. Organisms inherit two alleles for each phenotype
    4. In an allele pair, one is dominant while other is recessive

    Mendel’s idea that the pair of alleles of each parent separate and only one allele from each parent is passed to an offspring is explained by:

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    • Law of segregation is the second law of inheritance
    • Law of inheritance is based on the following:
    1. Gene can exist in various versions called alleles
    2. During meiosis, separation of allelic pair occurs providing single allele to each gamete
    3. Organisms inherit two alleles for each phenotype
    4. In an allele pair, one is dominant while other is recessive

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