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Genetics Basics Quiz

#1

What is the basic unit of heredity?

Gene
Explanation

Genes are the basic units of heredity, carrying genetic information that determines traits and characteristics.

#2

What is a codon in the context of genetics?

A triplet of nucleotides that codes for an amino acid
Explanation

A codon is a sequence of three nucleotides in DNA or RNA that codes for a specific amino acid during protein synthesis.

#3

In genetics, what does the term 'heterozygous' mean?

Having two different alleles for a particular gene
Explanation

Heterozygous individuals have two different alleles for a particular gene.

#4

In human genetics, what is the typical chromosome number in somatic cells?

46
Explanation

The typical chromosome number in somatic cells of humans is 46, arranged in 23 pairs.

#5

Which scientist is credited with discovering the structure of DNA?

James Watson and Francis Crick
Explanation

James Watson and Francis Crick are credited with the discovery of the double helical structure of DNA.

#6

What is the function of RNA in the cell?

Protein synthesis
Explanation

RNA plays a crucial role in protein synthesis, acting as a messenger between DNA and the ribosomes.

#7

What is the role of mitosis in the cell cycle?

Cell division for growth and repair
Explanation

Mitosis is the process of cell division that leads to the growth and repair of tissues.

#8

Which of the following genetic disorders is caused by an abnormality in the number of sex chromosomes?

Turner syndrome
Explanation

Turner syndrome is a genetic disorder caused by the absence of one X chromosome in females.

#9

Which of the following is a sex-linked trait?

Color blindness
Explanation

Color blindness is a sex-linked trait, often associated with the X chromosome.

#10

Which process involves the exchange of genetic material between homologous chromosomes during meiosis?

Crossing over
Explanation

Crossing over is the process during meiosis where genetic material is exchanged between homologous chromosomes.

#11

What is the name of the process where genetic information is transferred from DNA to RNA?

Transcription
Explanation

Transcription is the process where genetic information is transcribed from DNA to RNA.

#12

In a Punnett square, what does each box represent?

A genotype
Explanation

Each box in a Punnett square represents a possible genotype resulting from the combination of parental alleles.

#13

What is the purpose of the Human Genome Project?

To map and sequence the entire human genome
Explanation

The Human Genome Project aims to map and sequence the complete set of genes in the human genome.

#14

Which type of RNA carries amino acids to the ribosome during protein synthesis?

tRNA
Explanation

tRNA (transfer RNA) carries amino acids to the ribosome during the process of protein synthesis.

#15

What is the term for the phenomenon where one gene influences multiple, seemingly unrelated traits?

Pleiotropy
Explanation

Pleiotropy is the phenomenon where a single gene influences multiple and seemingly unrelated traits.

#16

What is the purpose of the Hardy-Weinberg equilibrium in population genetics?

To predict allele frequencies in the next generation
Explanation

The Hardy-Weinberg equilibrium helps predict allele frequencies in populations under certain conditions of genetic equilibrium.

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