GeneticsMendelian Genetics
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Mendelian Principles in Genetics Quiz

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#1

Which of the following is NOT one of Mendel's principles of genetics?

Principle of Recombination
Explanation

Not a principle described by Mendel.

#2

What is the term for a gene that is located on the X or Y chromosome?

Sex-linked gene
Explanation

Gene located on one of the sex chromosomes.

#3

In genetics, what term refers to the alternative form of a gene?

Allele
Explanation

Different versions of a gene.

#4

Which of the following accurately describes Mendel's Law of Segregation?

Each allele segregates into different gametes during gamete formation.
Explanation

Alleles separate during gamete formation.

#5

In genetics, what term describes the process by which genes located on the same chromosome are inherited together?

Linkage
Explanation

Genes physically close on a chromosome.

#6

What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous individuals?

25%
Explanation

Occurs when both parents contribute the recessive allele.

#7

Which of the following crosses would NOT produce a 3:1 phenotypic ratio according to Mendel's principles?

TT × Tt
Explanation

Both parents have the same genotype, resulting in a 100% dominant phenotype.

#8

What is the term for an allele that is expressed when present in either the homozygous or heterozygous condition?

Dominant allele
Explanation

Expressed regardless of the presence of another allele.

#9

Which of the following statements best describes Mendel's Law of Independent Assortment?

Genes located on separate chromosomes assort independently during gamete formation.
Explanation

Alleles of different genes segregate independently during gamete formation.

#10

In a cross involving a homozygous dominant individual and a homozygous recessive individual, what will be the genotype of the offspring?

All heterozygous
Explanation

Resulting offspring have one dominant and one recessive allele.

#11

In a dihybrid cross involving two heterozygous individuals (AaBb × AaBb), what phenotypic ratio would be expected according to Mendel's principles?

9:3:3:1
Explanation

Ratio of phenotypes resulting from independent assortment of alleles.

#12

In a test cross, an individual with a dominant phenotype but unknown genotype is crossed with a homozygous recessive individual. What is the purpose of this cross?

To determine if the individual is homozygous dominant or heterozygous.
Explanation

Reveals the genotype of the dominant individual.

#13

Which of the following is NOT a limitation of Mendel's principles?

Codominance
Explanation

Codominance is a different genetic concept.

#14

Which of the following represents a case of polygenic inheritance?

Skin color in humans
Explanation

Controlled by multiple genes.

#15

Which of the following represents an example of epistasis?

Albinism in humans
Explanation

Interaction between different genes influencing phenotype.

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