In our normal day to day life, we usually observe casual mention of this or that gene “skipping generations.” Is this possible? Can genes skip generations? As posed, the answer to this question is “no.” Genes do not disappear and then reappear in later generations. But the manifestation or expression of genes — traits — can skip generations under some circumstances. Come and enroll geneology4u to know more about genes and their consequences on generation-skipping criteria.
How genetics, chromosomes, and DNA are responsible for the coming generation?
First, we have a quick lesson on genetics on our website. With this if you experiencing have a passing familiarity with how inheritance works, you may want to just skip the next bit. Genes, or “loci,” (singular: locus) are regions of DNA, but not the DNA sequence in the region. (The term “genealogy” is sometimes used to mean other things, but this is the definition I’ll be using for this discussion.)
The actual sequence of DNA at the locus is called an “allele.” A gene or locus is where the DNA is found that produces a particular trait, and the allele at the locus determines the nature of the trait. For example, there are DNA and CHROMOSOMES that control finger length. You might have an allele at that locus that gives you long fingers or an allele that gives you short fingers. At a locus that controls eye color, you could have an allele that gives you blue eyes or an allele that gives you green eyes. (Eye color is controlled by many different genes, but I hope this gives you the idea.)
Do genes except for the sex chromosomes?
This is true for all genes except those that are located on the sex chromosomes. The X and Y chromosomes have different genes on them. Human females, who have two X chromosomes, have two copies of each gene on the X chromosome. Human males, who have one X and one Y, have only one copy of all of the genes on the X chromosome, and one copy of all of the genes on the Y chromosome. When there is a recessive allele on a chromosome that there is not a second version of (i.e. the X and Y chromosomes in males), it will be expressed even though there is only one copy of it, because there is no other allele to be dominant over it.
For people with two X chromosomes, one is inherited from each of her parents. Her mother, who has two X chromosomes herself, gives one of her two X’s at random. From her father, she will inherit the only X chromosome he has. For people with one X and one Y, the X always comes from the mother (who only has X’s to give) and the Y always comes from the father. This has some very particular implications for inheritance.
On our website, you can discover more about sex chromosomes, DNA and genes and how they affect the generations and their solutions efficiently using the family tree. Enroll geneology4u now!