$CATEGORY: Science - Khan Academy/9.Heredity & Evolution/9.Heredity & Evolution--Heredity

//Multiple Choice

In Mendel's monohybrid cross, the F1 generation was\: {
    =All dominant
    ~All recessive
    ~A mix of dominant and recessive
    ~All hybrid
}

The phenotypic ratio of the F2 generation in a monohybrid cross is\: {
    ~1\:1
    =3\:1
    ~1\:2\:1
    ~9\:3\:3\:1
}

In Mendel's experiment, the trait for tall plants (T) is considered\: {
    ~Recessive
    =Dominant
    ~Hybrid
    ~None of the above
}

In Mendel's monohybrid cross, what was the ratio of genotypes in the F2 generation? {
    =1\:2\:1
    ~3\:1
    ~2\:1
    ~9\:3\:3\:1
}

The law of segregation states that\: {
    ~Alleles for different traits separate independently
    ~Each organism has two alleles for each trait
    ~The dominant allele always expresses itself
    =Alleles for a trait separate during gamete formation
}

In Mendel’s experiment, the F1 generation of a cross between two pure-breeding plants (TT and tt) was\: {
    =All tall
    ~All short
    ~Half tall, half short
    ~Hybrid with mixed traits
}

The recessive allele in Mendel's monohybrid cross is represented by\: {
    ~T
    =t
    ~TT
    ~Tt
}

In Mendel's monohybrid cross, the genotype of the F1 generation is\: {
    ~TT
    ~tt
    =Tt
    ~Tt and tt
}

The F2 generation in Mendel's monohybrid cross showed a phenotypic ratio of\: {
    ~1 tall\: 1 short
    =3 tall\: 1 short
    ~2 tall\: 2 short
    ~1 tall\: 2 short
}

In a monohybrid cross, the offspring with genotype Tt will have the same phenotype as the offspring with genotype\: {
    =TT
    ~tt
    ~Tt and tt
    ~None of the above
}

//True or False

In Mendel’s monohybrid cross, the F1 generation showed both dominant and recessive traits. {F}

Mendel's law of segregation states that each organism has two alleles for each trait, one from each parent. {T}

In Mendel’s monohybrid cross, the recessive trait appeared in the F1 generation. {F}

The phenotypic ratio in the F2 generation of a monohybrid cross is always 3\:1. {T}

The genotype of a heterozygous individual in Mendel’s experiment is represented by TT. {F}

In Mendel’s experiment, the F2 generation showed a 1\:2\:1 genotypic ratio. {T}

In a monohybrid cross, the dominant allele is always represented by a lowercase letter. {F}

Mendel’s monohybrid cross was conducted using pea plants with contrasting traits, such as tall and short plants. {T}

The law of independent assortment is applicable only to monohybrid crosses. {F}

In Mendel’s monohybrid cross, the F2 generation had a phenotypic ratio of 3 dominant to 1 recessive. {T}

//Fill in the blanks

In Mendel's monohybrid cross, the dominant trait is represented by the allele ________. {
    =T
    ~t
    ~TT
    ~Tt
}

The F1 generation of Mendel’s monohybrid cross was ________ for the trait under study. {
    ~Homozygous
    =Heterozygous
    ~Recessive
    ~Purebred
}

The genotype of the F2 generation in Mendel's monohybrid cross is ________. {
    ~TT
    ~tt
    ~Tt
    =TT, Tt, and tt
}

The phenotypic ratio of the F2 generation in a monohybrid cross is ________. {
    ~1\:1
    =3\:1
    ~2\:1
    ~9\:3\:3\:1
}

The recessive trait in Mendel’s experiment was ________ in the F1 generation. {
    ~Expressed
    =Not expressed
    ~Partially expressed
    ~Expressed in some offspring
}

The law of ________ states that each pair of alleles segregates independently during gamete formation. {
    ~Dominance
    =Segregation
    ~Independent assortment
    ~Inheritance
}

In Mendel's monohybrid cross, the short trait is represented by the allele ________. {
    ~T
    =t
    ~TT
    ~Tt
}

The genotype of the F1 generation in Mendel’s monohybrid cross was ________. {
    ~TT
    ~tt
    =Tt
    ~Tt and TT
}

The ratio of homozygous dominant to heterozygous individuals in the F2 generation of a monohybrid cross is ________. {
    ~1\:2
    ~1\:1
    ~1\:3
    =1\:2\:1
}

The F2 generation of Mendel's monohybrid cross showed a phenotypic ratio of ________ tall to short plants. {
    ~1\:1
    =3\:1
    ~2\:1
    ~9\:3\:3\:1
}

//Numericals

In Mendel's monohybrid cross, the number of tall plants in the F2 generation was 750 and the number of short plants was 250. What is the phenotypic ratio? {
    ~1\:1
    ~2\:1
    =3\:1
    ~9\:3\:3\:1
}

In Mendel's monohybrid cross, the number of offspring in the F2 generation was 1000. How many of them would you expect to be homozygous dominant (TT)? {
    ~250
    ~500
    =250 or 500 (250 is more accurate)
    ~100
}

In Mendel's monohybrid cross, the number of heterozygous plants (Tt) in the F2 generation was 500. What is the genotype ratio? {
    =1\:2\:1
    ~3\:1
    ~2\:1
    ~9\:3\:3\:1
}

In a monohybrid cross, if the F2 generation has 800 plants, how many of them would be expected to show the dominant phenotype (tall)? {
    =600
    ~800
    ~200
    ~400
}

If the F2 generation consists of 1000 plants in a monohybrid cross, how many plants would you expect to be homozygous recessive (tt)? {
    ~200
    =250
    ~500
    ~100
}

In a monohybrid cross, the F1 generation consists of 200 plants. If the genotypic ratio is 1\:2\:1, how many plants are expected to be heterozygous (Tt)? {
    ~50
    =100
    ~150
    ~200
}

In Mendel's experiment, if the total number of F2 plants is 1200, how many plants would you expect to be homozygous dominant (TT)? {
    ~300
    =400
    ~600
    ~100
}

In Mendel's monohybrid cross, if the total number of F2 plants is 400, how many would you expect to be short (tt)? {
    =100
    ~150
    ~200
    ~50
}

In Mendel's experiment, if 75% of the F2 generation exhibits the dominant phenotype, how many plants in a group of 800 will show the dominant phenotype? {
    =600
    ~500
    ~700
    ~800
}

In Mendel's monohybrid cross, if the number of heterozygous plants (Tt) in the F2 generation is 600, how many plants will be homozygous recessive (tt) in a total of 1000 plants? {
    ~200
    =250
    ~300
    ~500
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:



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