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☆☆☆☆☆autosomal recessive
down syndrome
This is called co-dominance. This is when 2 or more alleles are expressed at the same time. In other words they both affect the phenotype. In the example of human blood ABO type we have an allele for A = IA, B= Ib O=i
IAIb = AB blood type
IbIb = B blood type
Iai = A
IaIa = A bloody type
Ibi = B blood type
ii = O blood type
fluid mosaic
Reddish-white horse
dihybrid cross
Down syndrome (trisomy 21) is a disorder associated with an error in the number of chromosomes present. Other examples of disorders associated with an error in the number of chromosomes are Trisomy 18 (Edwards Syndrome), Trisomy 13 (Patau Syndrome), Triple X syndrome, and Klinefelter Syndrome.
Humans produce few offspring slowly
50%
cystic fibrosis (:
cystic fibrosis :)
cystic fibrosis ^-^
Mary's father is normal and has a normal genotype X*Y while her mother is the carrier of hemophilia and has one X of her genotype infected i.e. she is X*X.
non disjunction of sex chromosomes
A pedigree chart is used to study human patterns of inheritance.
A+ Neither parent can have type O blood
true
