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Genetics is the study of heredity, which is the process by which a parent passes certain genes onto their children.
Children inherit their biological parents' genes, which express specific traits such as physical characteristics, natural talents, and genetic disorders.
Heredity describes how certain traits are passed from parents to their children through genes.
Genes are small sections of DNA that code for specific traits and are found on chromosomes.
Humans have two sets of 23 chromosomes, one set inherited from each parent.
An allele is a variant form of a gene that can exist at a specific locus on a chromosome.
A dominant allele is expressed even if paired with a recessive allele, while a recessive allele is only visible when paired with another recessive allele.
Homozygous refers to having two identical alleles for a particular gene at a locus.
Heterozygous refers to having two different alleles for a particular gene at a locus.
Genotype refers to the genetic makeup of an individual at a specific locus, while phenotype refers to the observable expression of that genotype, such as traits like hair color or weight.
Mendelian inheritance is the pattern of inheritance that follows the laws established by Gregor Mendel, which describe how traits are passed from parents to offspring through dominant and recessive alleles.
A genome is the complete set of genetic information in an organism, including all of its genes.
DNA is structured as a double helix, consisting of two strands that are held together by hydrogen bonds between complementary bases.
DNA serves as the genetic material that stores information and provides the blueprint for building proteins, while RNA plays a crucial role in transferring this information to synthesize proteins.
The sugar-phosphate backbone provides structural support to the DNA molecule, allowing it to maintain its double helix shape and stability.
In DNA, adenine pairs with thymine (A::T) and cytosine pairs with guanine (C::G) through hydrogen bonds.
Nucleotides are the building blocks of DNA, consisting of a sugar, a phosphate group, and a nitrogenous base, and they link together to form the DNA strand.
The directionality of DNA, indicated by the 3' and 5' ends, is crucial for processes such as replication and transcription, as enzymes read and synthesize DNA in a specific direction.
Hydrogen bonds between complementary bases hold the two strands of the DNA double helix together, providing stability while allowing the strands to separate during replication and transcription.
ATP, or adenosine triphosphate, is a modified nucleotide that serves as the primary energy carrier in cells, consisting of adenine, ribose, and three phosphate groups.
DNA contains deoxyribose sugar, is double-stranded, and uses thymine as a base, while RNA contains ribose sugar, is single-stranded, and uses uracil instead of thymine.