In humans, normal skin pigmentation is influenced
by a dominant gene (C), which allows pigmentation
to develop. All individuals who are homozygous for
the recessive allele (c) are unable to produce an
enzyme needed for melanin formation and are
therefore referred to as albino. Two normal parents
produce an albino child. What are the chances that
the next child will be an albino? What will be an ideal response?
Answer: 1/4 chance
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What occurs during a modified radical mastectomy?
A. Only the breast is removed. B. Only the lump is removed. C. The breast, lymph nodes, and pectoral muscles are removed. D. The breast and underarm lymph nodes are removed.
You see a killifish jumping around on the surface before it is consumed by a bird. You conclude the fish was
A) trying to scare off the predator. B) hunting for flying insects. C) infected with a trematode. D) starving to death.
When amino acid tryptophan is readily available on the growth media, bacteria do not have to synthesize this molecule. Genes controlling this mechanism are under control of
A. A reproducible operon B. An inducible operon C. Catabolic repression D. Global regulation E. A repressible operon
Which of the following is evidence that the transition to multicellularity did not require the origin of large numbers of novel genes?
a. The multicellular groups, animals and fungi, are unikonts. Some studies based on whether the genes for DHFR and TS are separate or fused indicate the unikonts were the first group of eukaryotes to diverge. b. The cadherin proteins of animals, which are involved in animal cell adherence to each other, contain only one novel domain not found in the cadherin proteins of unicellular choanoflagellates. c. Multicellularity evolved once and may have involved two stages: First, colonies arose as dividing cells remained attached by their shared cell walls; then differentiated cells arose as some cells became specialized for reproduction. d. Genomic studies indicate that multicellular Volvox has few novel genes compared with unicellular Chlamydomonas, and the cadherin proteins of animals, which are involved in animal cell adherence to each other, contain only one novel domain not found in the cadherin proteins of unicellular choanoflagellates. e. Genomic studies indicate that multicellular Volvox has few novel genes compared with unicellular Chlamydomonas.