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- 26 listopada 2022
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For those who breed poultry or are thinking about reproduction chicken, a basic expertise in chicken family genes is essential. Particularly, it’s useful to comprehend the key elements off family genes and you may knowing as to why particular attributes can be found in a number of chickens.
This new sex chromosomes bring the new genetic situation that determines the newest intercourse out-of a young children. A human acquiring the sex chromosomes XX try females, and you will a person having the sex chromosomes XY is male. In chickens, the brand new intercourse chromosomes is actually described as Z and you will W. A turkey acquiring the sex chromosomes ZW try lady, and you will a turkey obtaining sex chromosomes ZZ was male. New sex chromosomes from animals and wild birds try illustrated into the Figure 1.
Since the chromosomes come into pairs, genetics arrive pairs. Each mother or father contributes one gene from inside the each group of family genes. The fresh phenotype to possess a certain characteristic for the a poultry relies on the brand new makeup of the gene couples for that characteristic. Should your genetics are identical, the fresh hereditary county is called homozygous . In the event the genes are very different, the new genetic county is known as heterozygous . An effective gene that can show itself from the homozygous county otherwise the latest heterozygous state is referred to as a dominant basis . A beneficial gene which can share by itself simply throughout the homozygous county is called a recessive factor . When discussing a trait where there’s a dominating gene and you can a beneficial recessive gene, about three requirements (combos of your own genetics about gene couple) may appear. The latest homozygous dominating updates occurs when each other genes introduce are the principal gene. This new homozygous recessive condition occurs when both genes present are the recessive gene. The fresh new heterozygous updates occurs when you to gene establish 's the prominent gene therefore the most other 's the recessive gene. (The two variation kinds of the newest gene in such a great gene pair are called alleles.)
Generally speaking, regarding the heterozygous reputation, the dominating gene is shown along side recessive gene. In certain gene pairs, yet not, for each gene can perform a point of term in the heterozygous reputation. This phenomenon is referred to as codominance. The sum away from for each gene el mejor sitio de citas para hacer amigos regarding the couples should be equivalent, and/or share will be ruled far more by one gene than just additional.
So you’re able to confuse something further, not all characteristic are controlled by one set of family genes. A specific feature should be subject to multiple gene sets. Such faculties are called decimal faculties . Brownish shell color when you look at the eggs, particularly, try subject to as much as thirteen genetics. The result is the range of brown color present in egg applied by more breeds of birds.