What is the structure of DNA and RNA?
DNA and RNA are made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogen base. The nitrogen bases pair in specific ways: adenine with thymine (or uracil in RNA) and cytosine with guanine.
What are homologous chromosomes?
Homologous chromosomes are pairs of chromosomes that have the same structure and carry genes for the same traits, one inherited from each parent.
What is the difference between sex chromosomes and autosomes?
Sex chromosomes determine an individual’s sex (X and Y), while autosomes are the non-sex chromosomes that are the same in both sexes.
What is a karyotype used for?
A karyotype is used to visually represent chromosomes and can help identify chromosome abnormalities such as monosomy (missing a chromosome) and trisomy (extra chromosome).
What is gene expression?
Gene expression is the process by which information from a gene is used to synthesize a functional gene product, typically proteins, involving transcription and translation.
What are the steps involved in transcription?
Transcription involves the unwinding of DNA, the synthesis of mRNA from the DNA template, and the processing of mRNA before it exits the nucleus.
What is translation?
Translation is the process of synthesizing proteins from mRNA, involving ribosomes and tRNA that read the codon chart to assemble amino acids into a polypeptide chain.
How are genotypes represented?
Genotypes are represented using symbols (letters) for the alleles present for a gene, with superscripts used to denote co-dominance and incomplete dominance.
What are dominant and recessive phenotypes?
Dominant phenotypes are expressed when at least one dominant allele is present, while recessive phenotypes are expressed only when two recessive alleles are present.
What are the types of dominance?
Types of dominance include complete dominance, where one allele completely masks the other; co-dominance, where both alleles are expressed equally; and incomplete dominance, where the phenotype is a blend of both alleles.
How do environmental and epigenetic factors affect phenotype?
Environmental factors and epigenetic modifications can influence gene expression, thereby affecting an individual’s phenotype.
What is a pedigree chart?
A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism from one generation to the next.
How do you analyze pedigree charts?
Analyzing pedigree charts involves determining the genotypes of individuals based on their phenotypes and family relationships.
What is a monohybrid cross?
A monohybrid cross is a genetic cross between individuals that involves one pair of contrasting traits, used to predict genetic outcomes.
What is a monohybrid test cross?
A monohybrid test cross is performed to determine the genotype of an organism by crossing it with a homozygous recessive individual.
What is a chromosome?
Chromosomes are structures that contain DNA.
What is a gene?
Genes are segments of DNA that code for proteins.
What is an allele?
Alleles are different versions of a gene.
What is a genome?
A genome is the complete set of genes in an organism.
What is a karyotype?
A karyotype is a visual representation of an organism’s chromosomes.
