Nikolay's Genetics Lessons’ Post

How to find the order of genes on chromosome We can see if two genes are linked, and how tightly, by using data from genetic crosses to calculate the recombination frequency. By finding recombination frequencies for many gene pairs, we can make linkage maps that show the order and relative distances of the genes on the chromosome. Youtube video: https://lnkd.in/dnNfvGAu #nikolaysgeneticslessons

What are Additive genetic effects? Additive genetic effects occur when two or more genes source a single contribution to the final phenotype, or when alleles of a single gene (in heterozygotes) combine so that their combined effects equal the sum of their individual effects. Non-additive genetic effects involve dominance (of alleles at a single locus) or epistasis (of alleles at different loci). Youtube video: https://lnkd.in/drKhVpic #nikolaysgeneticslessons

How to determine sequence of genes on chromosome Gene mapping describes the methods used to identify the locus of a gene and the distances between genes. The essence of all genome mapping is to place a collection of molecular markers onto their respective positions on the genome. Molecular markers come in all forms. Youtube video: https://lnkd.in/dPTeEJrB #nikolaysgeneticslessons

Gene linkage and recombination explained 2 Gene mapping describes the methods used to identify the locus of a gene and the distances between genes. The essence of all genome mapping is to place a collection of molecular markers onto their respective positions on the genome. Youtube video: https://lnkd.in/dnKFybmR #nikolaysgeneticslessons

9:4:3 phenotypic Ratio explained Epistasis is the phenomenon where the effect of one gene (locus) is dependent on the presence of one or more 'modifier genes', i.e. the genetic background. Originally the term meant that the phenotypic effect of one gene is masked by a different gene (locus). Youtube video: https://lnkd.in/d6qTgWju #nikolaysgeneticslessons

What is a codon? Explanation. What is a codon in simple terms? A codon is a trinucleotide sequence of DNA or RNA that corresponds to a specific amino acid. The genetic code describes the relationship between the sequence of DNA bases (A, C, G, and T) in a gene and the corresponding protein sequence that it encodes. The cell reads the sequence of the gene in groups of three bases. Youtube video: https://lnkd.in/dqFbuCan #nikolaysgeneticslessons

Gene linkage Genetic linkage describes the way in which two genes that are located close to each other on a chromosome are often inherited together. ... In fact, the closer two genes are to one another on Youtube video: https://lnkd.in/dCwvABtb #nikolaysgeneticslessons

How gene mapping works During meiosis, the two chromosomes in each homologous pair exchange segments, through a process called crossing over. This process of crossing over and the resulting recombination, \(exchange of gene alleles across the chromosomes in a pair\) enables us to reason about genetic mapping - that is, about the order of genes on a chromosome and the distances among the genes. Youtube video: https://lnkd.in/diwmqZjP \#nikolays_genetics_lessons

DNA mapping (interrupted mating) Interrupted mating definition. A technique used to map bacterial genes by determining the sequence in which donor genes enter recipient cells. A gene mapping technique in which bacterial conjugation is disrupted after specified time intervals. Youtube video: https://lnkd.in/dc3hiPsX #nikolaysgeneticslessons

What is Codominance? Definition Situation in which two different alleles for a genetic trait are both expressed. Definition from: Human Genome Project InformationThis link leads to a site outside Genetics Home Reference. at the U.S. Department of Energy Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked. In codominance, however, neither allele is recessive and the phenotypes of both alleles are expressed. Youtube video: https://lnkd.in/dcY-mA3H \#nikolays_genetics_lessons