New combination of genotypes

• What are pure breeding pants ?

  
  

  Plants containing the same two alleles on each of the homologous chromosomes (tt or TT)
• What is a monohybrid cross?

  
  

  study of a cross between individuals which studies only a single trait (Yellow and Green)
• First generation flowers all show the dominant allele/characteristic (yellow)
• Second generation of flowers shows 3:1 ratio (3 yellow offspring to 1 green)
• What is sex linkage?

  
  

  the genes that are located on the sex chromosomes
• what is Sex-linked inheritance ?

  
  

  when an organism has one pair of sex chromosome, with males having XY and females XX
• Humans contain 22 pairs of autosomal (non sex) cells and 1 pair of sex chromosomes which determine the gender
• If a female has a recessive sex link trait = 100% of her male offspring will have the trait.
• Female offspring  WILL inherit the allele linked to their father
• What is codominance?

  
  

  occurs when alleles of a gene pair in heterozygous are both fully expressed in the phenotype (neither allele is dominant or reccessive). each allele is represented by a CAPTITAL LETTER
• What is an example of codominance ?

  
  

  Seen in cows. If a red and a white cow mate they will create a third phenotype which is white with red spots
• what is Incomplete dominance ?

  
  

  occurs when one allele for a specific trait is not completely expressed over its paired allele. The phenotypes of parents blend together fir form a new one. Each allele is expressed as a capital letter
• What is an example of incomplete dominance ?

  
  

  snap dragon flowers, if a parent flower is red mates with a parents flower that is white then their children's flowers will be pink as neither parent was able to express all of their genes