Which of the following represents a reversible reaction?
A. A + B ? AB
B. AB + XY ? AY + XB
C. AB ? A + B
D. AB + XY ? AY + XB
Answer: B
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If one parent has achondroplasia, and the other is normal, what are the odds that they could have a normal child?
a. 0 b. 25% c. 50%. d. 75% e. 100%
Which outcome could help you identify a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?
A. A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant trait. B. The trait varies along a continuum in the population. C. All of the alleles of the gene for that trait are equally expressed. D. Pleiotropy occurs.
The MMR vaccine protects against measles, _______, and rubella.
Fill in the blank(s) with the appropriate word(s).
Choose the phase of meiosis in column 2 that best matches each event in column 1
A) telophase I B) prophase I C) prophase II D) metaphase I E) telophase II F) metaphase II G) anaphase I H) anaphase II 1) aligning of bivalents in the center of a spindle 2) genetic recombination events take place 3) separation of homologous chromosomes 4) one haploid set of replicated chromosomes at each spindle pole 5) divisible into five distinct stages 6) aligning of monovalents in the center of a spindle 7) one haploid set of unreplicated chromosomes at each spindle pole 8) pairing of homologous chromosomes 9) chiasmata are visible 10) separation of sister chromatids 11) shortest stage