IGCSE Biology Notes
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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