Sunday, June 25, 2017

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

GENETIC DIAGRAM: Means of determining all possible genetic characteristics of Offspring based on genetic characteristics of prospective parents


GENDER DETERMINATION OF OFFSPRING:
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  • Females possess two copies of the X Chromosome (XX)
  • Males possess one X and a shorter Y Chromosome (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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2 comments:

  1. UnknownMarch 9, 2019 at 1:31 AM

    The gametes, is it not meant to be XX and not just X for females?

    ReplyDelete

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