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DOMINANT
      AND
    RECESSIVE
 
     TRAITS
         
DOM I NA NC E T R A I T S :



    Dominance in genetics  is a relationship between two  alleles of a gene, in 
    which one allele masks the  phenotype (the expression that we can see in the 
    outside) of another allele at the same genetics.




                                        
R E C E S S IV E T R A IT S :

    A recessive trait is a trait caused by a recessive gene, which means 
    that someone must inherit two copies of the gene for the trait to 
    manifest.
    When organisms such as humans reproduce, they produce young 
    with a genetic inheritance from both parents, caused by the fusing of 
    haploid sperm with haploid eggs to create a diploid organism.(In our 
    case we have 46 chromosomes, 23 comes from each parent), so  
    each chromosome contains a series of alleles or genes which code 
    various information.




                                          
     
E X P L A N A T IO N :
    
      ­When someone is heterozygous, however, one of the alleles will remain 
inactive, and this allele represents a recessive trait. 


        ­Gregor Mendel(considered the father od genetics beacuse of his experiments 
on the fields)did much of his work with peas. In the course of his research, he 
learned that purple was a dominant trait for flower color, meaning that a flower only 
had to inherit one purple gene to produce purple flowers.


   ­When someone is heterozygous for a trait, the difference between dominant and 
recessive traits becomes more important, because the dominant trait is the one 
which will manifest.



                                             
F O R E XA M P L E :

    When the alleles from both parents are the same(AA­AA), someone is said to 
    be homozygous at that allele. If a child inherits two different alleles, such as a 
    gene for red hair(RR) and a gene for brown hair(BB), he or she is said to be 
    heterozygous at that allele: 
         
           ­When someone inherits the same allele twice,, that trait will manifest           
             whether or not it is dominant. 
               
             ­When someone is heterozygous, however, one of the alleles will                
              remain inactive, and this allele represents a recessive trait.




                                                
     
E XA M P L E S


In the simplest case, where a gene exists in two allelic forms ( A and  b), 
three combinations of  genotypes(alleles) are possible: 
                           

                           ­AA: Homozygotic dominant.
                           ­ Ab: Heterozygotic dominat.
                           ­bb:HOmozygotic recessive. 

­If AA and bb individuals (homozygotics) show different forms of the trait 
(phenotype), and Ab individuals (heterozygotics) show the same phenotype 
as AA individuals, then allele A is said to dominate or be dominant to or 
show dominance to allele b, and b is said to be recessive to A.

                                            
E XA M P L E S :
1­The language of genetics consists of symbols and rules for using these symbols.When the
trait  that we are studying is dominant we use a capital letter to show its symbol. When we
represent the recessive trait from the same trait we put the same letter but not capitalized.
EXAMPLE: 
 ­If we have a tall pea plant dominat iver a short pea plant it will be represented like that:
                                 Dominan(tall): T
                                 Recessive(short): t
2­The following letters represent pairs of alleles.we have to indicate whether each pair is a
heterozygote(hybrid) or homozygote(purebrid).Later we can indicate whether each pair would
display a dominant or recessive phenotype

      ­DD:Homozygotic dominant                            ­Dd:Heterozygotic dominant
      ­ss:Hmozygotic recessive                                  ­Rr: Heterozygotic dominant
      ­Tt:Heterozygotic dominant                              ­yy:Homozygotic recessive
                                                         
S OURC ES :
I've got my information from these places:




http://www.wisegeek.com/what­is­a­recessive­trait.htm


http://en.wikipedia.org/wiki/Dominance_(genetics)


­My notebook and my own nowledge.



                                 

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Trabajo naturales dominat and recessive genes.

  • 1. DOMINANT AND RECESSIVE   TRAITS  
  • 2. DOM I NA NC E T R A I T S : Dominance in genetics  is a relationship between two  alleles of a gene, in  which one allele masks the  phenotype (the expression that we can see in the  outside) of another allele at the same genetics.    
  • 3. R E C E S S IV E T R A IT S : A recessive trait is a trait caused by a recessive gene, which means  that someone must inherit two copies of the gene for the trait to  manifest. When organisms such as humans reproduce, they produce young  with a genetic inheritance from both parents, caused by the fusing of  haploid sperm with haploid eggs to create a diploid organism.(In our  case we have 46 chromosomes, 23 comes from each parent), so   each chromosome contains a series of alleles or genes which code  various information.    
  • 4.    
  • 5. E X P L A N A T IO N :            ­When someone is heterozygous, however, one of the alleles will remain  inactive, and this allele represents a recessive trait.          ­Gregor Mendel(considered the father od genetics beacuse of his experiments  on the fields)did much of his work with peas. In the course of his research, he  learned that purple was a dominant trait for flower color, meaning that a flower only  had to inherit one purple gene to produce purple flowers.    ­When someone is heterozygous for a trait, the difference between dominant and  recessive traits becomes more important, because the dominant trait is the one  which will manifest.    
  • 6. F O R E XA M P L E : When the alleles from both parents are the same(AA­AA), someone is said to  be homozygous at that allele. If a child inherits two different alleles, such as a  gene for red hair(RR) and a gene for brown hair(BB), he or she is said to be  heterozygous at that allele:               ­When someone inherits the same allele twice,, that trait will manifest                     whether or not it is dominant.                       ­When someone is heterozygous, however, one of the alleles will                           remain inactive, and this allele represents a recessive trait.    
  • 7.    
  • 8. E XA M P L E S In the simplest case, where a gene exists in two allelic forms ( A and  b),  three combinations of  genotypes(alleles) are possible:                                                         ­AA: Homozygotic dominant.                            ­ Ab: Heterozygotic dominat.                            ­bb:HOmozygotic recessive.  ­If AA and bb individuals (homozygotics) show different forms of the trait  (phenotype), and Ab individuals (heterozygotics) show the same phenotype  as AA individuals, then allele A is said to dominate or be dominant to or  show dominance to allele b, and b is said to be recessive to A.    
  • 9. E XA M P L E S : 1­The language of genetics consists of symbols and rules for using these symbols.When the trait  that we are studying is dominant we use a capital letter to show its symbol. When we represent the recessive trait from the same trait we put the same letter but not capitalized. EXAMPLE:   ­If we have a tall pea plant dominat iver a short pea plant it will be represented like that:                                  Dominan(tall): T                                  Recessive(short): t 2­The following letters represent pairs of alleles.we have to indicate whether each pair is a heterozygote(hybrid) or homozygote(purebrid).Later we can indicate whether each pair would display a dominant or recessive phenotype      ­DD:Homozygotic dominant                            ­Dd:Heterozygotic dominant      ­ss:Hmozygotic recessive                                  ­Rr: Heterozygotic dominant      ­Tt:Heterozygotic dominant                              ­yy:Homozygotic recessive    
  • 10. S OURC ES : I've got my information from these places: http://www.wisegeek.com/what­is­a­recessive­trait.htm http://en.wikipedia.org/wiki/Dominance_(genetics) ­My notebook and my own nowledge.