shows characteristics of both homozygotes
(usually at molecular level- e.g. blood groups)
IA = A antigen; IB = B antigen
IAIA type A
IBIB type B
IAIB type AB (both antigens evident at molecular level)
overdominance - answer✔is more extreme than either homozygote
Hb= normal hemoglobin; HbS = alternative form hemoglobin
HbHb normal- no anemia
HbSHbS sickle cell anemia
HbHbS no anemia (complete dominance) more resistant to malaria than either homozygote
(over-dominance)
Autosomal dominant trait: - answer✔1.) usually appears in both sexes with equal frequency
2.) both sexes transmit the trait to their offspring
3.) does not skip generations
4.) MUST HAVE parent for affected offspring
5.) one affected parent(heterozygous) + unaffected parent = 50% affected offspring
Autosomal recessive trait: - answer✔1.) usually appear in both sexes with equal frequency
2.) tends to skip generations
3.) affected offspring are usually born to unaffected parents
4.) when both parents are heterozygous, approximately one-fourth of the affected offspring
X-linked recessive trait: - answer✔. affected MALE CHILDREN must have heterozygous
mother
. SKIPS generations
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