Sex-Linked Inheritance (Grade 12 NSC Matric Life Sciences): Flashcards
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Sex-linked inheritance
Sex-linked inheritance
Traits from genes on sex chromosomes (especially X)
Autosomes
Autosomes
22 pairs of non-sex chromosomes
Male sex chromosome combination
Male sex chromosome combination
XY
Female sex chromosome combination
Female sex chromosome combination
XX
Colour blindness
Colour blindness
Cannot distinguish between certain colours
Haemophilia
Haemophilia
Bleeding disorder; blood cannot clot due to missing factors
Why males more affected by X-linked recessive disorders
Why males more affected by X-linked recessive disorders
Have only one X chromosome
Carrier female
Carrier female
Has one recessive allele; no symptoms but can pass it on
Y chromosome and sex-linked trait alleles
Y chromosome and sex-linked trait alleles
Y does not carry alleles for these traits
Recessive alleles for female to express X-linked disorder
Recessive alleles for female to express X-linked disorder
Two