QUESTION 37 Hemophilia is an X-linked recessive disorder and blood type is autosomal. If two healthy parents, one of which is blood A and the other blood type B, produce a son who has hemophilia and is type O, what is the probability that their next c will be a son with hemophilia and blood type B? 1/8 1/16 3/16 1/4 1/2 QUESTION 38 Heritability is a measurement that estimates the proportion of genetic variation in a group that can be attributed to phenotype. genetic variation in an individual that can be attributed to phenotype phenotypic variation in a group that can be attributed to genes. phenotypic variation in an individual that can be attributed to genes. QUESTION 39 Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. Given the fact that embryos with 48 chromosomes (four # 21 chromosomes) are not likely to survive early development, what percentage of surviving offspring would be expected to have Down syndrome if both parents have Down syndrome? all 2/3 1/2 none 1/3 QUESTION 40 In radishes, red and white are the pure-breeding colors and long and round are the pure-breeding shapes, while the hybrids are purple and oval. The cross of a purple long with a purple oval will produce all but which of the following phenotypes? red and oval purple and oval white and long purple and round red and long QUESTION 41 The discontinuous aspect of replication of DNA is caused by. topoisomerases cutting the DNA in a random fashion the 5' to 3' polarity restriction of synthesis trinucleotide repeats polymerase slippage sister-chromatid exchanges QUESTION 42 DNA polymerase III adds nucleotides in the place of the primer RNA after it is removed to the 5' end of the RNA primer to both ends of the RNA primer to the 3' end of the RNA primer to internal sites in the DNA template