The blood type A allele (IA) and blood type B allele (IB) are both completely dominant over the blood type O allele (i). The Blood type A allele and blood type B allele are codominant. A woman is blood type B and has 3 children with a partner of unknown blood type. One child is blood type A and 2 children are blood type O. What is the probability that child number 4 will be blood type B?
Read DetailsSpinal muscular atrophy (SMA) type I shows autosomal recessive inheritance. Assuming complete penetrance, if two heterozygous individuals have two children, what is the probability that the first child will be unaffected and the second child will be unaffected?
Read DetailsBlood type is determined by two genes. At least 1 dominant H gene allele is needed to build the H antigen: HH or Hh = H antigen, i.e., normal; hh = no H antigen, i.e., Bombay If an individual has the H antigen (i.e., is not Bombay), the I gene then determines blood type O, blood type A, blood type B or blood type AB (IAIA or IAi = blood type A; IBIB or IBi= blood type B; IAIB = blood type AB; ii = blood type O). H gene I gene HH or Hh = H antigen; hh = Bombay) (ii = blood type O) IAIB = type AB; IAIA or IAi = type A; IBIB or IBi = type B) Bombay → H antigen → blood types A, B, or AB What is the phenotype of the following individual: HhIAi?
Read DetailsBrittle bone disease type 1 shows autosomal dominant inheritance. Daniel is an affected male who would like to have a child with his unaffected partner but is worried about transmitting the affected allele to offspring. Daniel’s mother was also affected, but his father was not. Assuming complete penetrance, what is the expected phenotype of his offspring?
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