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

//Multiple Choice

According to Mendel’s Law of Segregation, alleles of a gene pair segregate during the formation of ________. {
    =Gametes
    ~Zygotes
    ~Somatic cells
    ~Chromosomes
}

In Mendel's experiment, the F1 generation of pea plants showed only the dominant trait. This is an example of ________. {
    ~Codominance
    ~Incomplete dominance
    =Dominance
    ~Recessiveness
}

The Law of Segregation states that each individual has ________ alleles for a gene, one from each parent. {
    =Two
    ~Three
    ~Four
    ~One
}

In a monohybrid cross, the F2 generation shows a phenotypic ratio of ________. {
    ~1\:1
    =3\:1
    ~9\:3\:3\:1
    ~1\:2\:1
}

Which of the following is an example of a dominant allele? {
    ~tt
    ~Tt
    ~tt or Tt
    =TT
}

According to Mendel’s Law of Independent Assortment, alleles for different traits ________. {
    =Separate independently of one another
    ~Always segregate together
    ~Combine to form new traits
    ~Cannot be inherited together
}

In a dihybrid cross, the expected phenotypic ratio of the F2 generation is ________. {
    ~1\:1
    ~3\:1
    =9\:3\:3\:1
    ~1\:2\:1
}

The genotype of a homozygous dominant individual is represented as ________. {
    ~aa
    ~Aa
    =AA
    ~A_
}

In a cross between two heterozygous pea plants (Tt × Tt), the expected genotypic ratio in the F2 generation is ________. {
    =1\:2\:1
    ~3\:1
    ~1\:1
    ~9\:3\:3\:1
}

In Mendel’s experiment with pea plants, the recessive trait appeared in the F2 generation due to ________. {
    =Segregation of alleles
    ~Independent assortment
    ~Dominance
    ~Hybrid vigor
}

//True or False

Mendel’s Law of Segregation states that each individual has two alleles for a gene, one inherited from each parent. {T}

In a monohybrid cross between two heterozygous individuals, the F2 generation will show a 1\:1 genotypic ratio. {F}

The Law of Dominance states that the recessive allele is expressed in the heterozygous condition. {F}

In a dihybrid cross, the expected phenotypic ratio in the F2 generation is 9\:3\:3\:1. {T}

The Law of Independent Assortment applies to genes located on the same chromosome. {F}

Homozygous dominant individuals can only pass on the dominant allele to their offspring. {T}

In a cross between two heterozygous individuals (Tt × Tt), the probability of obtaining a homozygous recessive (tt) offspring is 50%. {F}

In Mendel’s experiments, the dominant trait always appeared in the F1 generation. {T}

The genotypic ratio of a monohybrid cross between two heterozygous individuals is 3\:1. {F}

In a dihybrid cross, the probability of obtaining an offspring with the genotype AABb is 1/16. {T}

//Fill in the blanks

According to Mendel’s Law of ________, each pair of alleles segregates independently during gamete formation. {
    =Independent Assortment
    ~Dominance
    ~Segregation
}

In a monohybrid cross, the F2 generation shows a phenotypic ratio of ________. {
    ~1\:2\:1
    =3\:1
    ~9\:3\:3\:1
}

The Law of ________ states that during gamete formation, the two alleles for each gene separate. {
    =Segregation
    ~Dominance
    ~Independent Assortment
}

In Mendel’s experiments, the dominant allele was represented by the capital letter ________. {
    =T
    ~t
    ~A
}

The genotype of a heterozygous individual is represented as ________. {
    ~TT
    =Tt
    ~tt
}

According to Mendel’s Law of Dominance, the dominant allele will express its trait in the ________ condition. {
    ~Homozygous recessive
    =Homozygous dominant
    =Heterozygous
}

In a dihybrid cross, the expected phenotypic ratio in the F2 generation is ________. {
    ~1\:1
    =9\:3\:3\:1
    ~3\:1
}

The allele for the recessive trait is represented by a ________ letter. {
    ~Capital
    =Small
    ~Uppercase
}

In Mendel’s experiments, the F1 generation showed only the ________ trait. {
    ~Recessive
    =Dominant
    ~Hybrid
}

The genotypic ratio of a monohybrid cross between two heterozygous individuals (Tt × Tt) is ________. {
    ~1\:1
    =1\:2\:1
    ~3\:1
}

//Numericals

In a monohybrid cross between two heterozygous pea plants (Tt × Tt), what is the probability of getting a homozygous dominant (TT) offspring? {
    =25%
    ~50%
    ~75%
}

In a dihybrid cross (RrYy × RrYy), what is the expected phenotypic ratio in the F2 generation? {
    =9\:3\:3\:1
    ~1\:2\:1
    ~3\:1
}

In a cross between a homozygous dominant (AA) and a heterozygous (Aa) individual, what percentage of offspring will be heterozygous (Aa)? {
    ~25%
    =50%
    ~100%
}

If a plant with the genotype AaBb is crossed with another plant with the same genotype, what is the probability of getting an offspring with the genotype AABb? {
    ~25%
    ~50%
    =12.5%
}

In a monohybrid cross (Tt × Tt), what is the expected genotypic ratio in the F2 generation? {
    =1\:2\:1
    ~3\:1
    ~1\:1
}

In a cross between two heterozygous individuals (Tt × Tt), what is the probability of an offspring being homozygous recessive (tt)? {
    =25%
    ~50%
    ~75%
}

What is the probability of obtaining a recessive phenotype (tt) in a cross between two heterozygous pea plants (Tt × Tt)? {
    =25%
    ~50%
    ~75%
}

In a dihybrid cross (AaBb × AaBb), what is the probability of obtaining an offspring with the genotype AABb? {
    =1/16
    ~1/8
    ~1/4
}

In a cross between two individuals with the genotypes AaBb × AaBb, what is the probability of getting an offspring with the genotype AABb? {
    =1/16
    ~1/8
    ~1/4
}

If a homozygous dominant individual (RR) is crossed with a homozygous recessive individual (rr), what percentage of offspring will be heterozygous (Rr)? {
    ~25%
    ~50%
    =100%
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Law of segregation -> Each pair of alleles segregates independently during gamete formation
=Law of Dominance -> Dominant allele expresses its trait in both homozygous and heterozygous conditions
=Law of Independent Assortment -> Alleles for different traits separate independently
=Heterozygous -> An individual with two different alleles for a gene
}


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