Saturday, June 24, 2017

3.22: Describe the Determination of the Sex of Offspring at Fertilisation, Using a Genetic Diagram

GENETIC DIAGRAM: Shows all the Possible Genotypes of Offspring Using Parents Genotype

GENDER DETERMINATION OF OFFSPRING:

  • Two X Chromosomes Makes a Person a Female (XX)

  • One X and One Y Chromosome Makes a Person a Male (XY)

SEX DETERMINATION:

GENDER OF OFFSPRING
PHENOTYPES OF PARENTS
   
                            Male                         Female
                     (Father)                      (Mother)

GENOTYPES OF PARENTS
           
                        XY                                XX

GAMETES
 
GENOTYPES OF OFFSPRING

GENDER OF OFFSPRING
           
RATIO

                MALE   =    ½                FEMALE      =    ½  

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