Red-green color blindness is an X-linked recessive disorder. A woman with normal vision whose father was colorblind has children with a man with normal color vision. What is the probability that their first child will be colorblind?
A) 1/4
B) 1/2
C) 3/4
D) 0
E) 1
A
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane?
A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C. Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
Which of the following statements is true regarding the pollen of gymnosperms and angiosperms? Select all correct choices
A. Pollen grains from both of these plants consist of four cells. B. A single angiosperm produces more pollen than a single gymnosperm. C. Pollen from both types of plant form pollen tubes that factor in fertilization. D. Pollen from both types of plants contain (or will form) haploid (1n) male gametes.
How does incomplete dominance affect the phenotype of a heterozygote?
A) It results in a blend of the dominant and recessive phenotypes. B) It results in the expression of only the recessive phenotype. C) The dominant phenotype is still expressed, but only in patches. D) The trait is not observed in the individual.
Which of the following is NOT a reason that an animal's gut is a favorable habitat for mutualistic microorganisms?
a. Constant temperature b. Ready supply of nutrients c. Inhospitable conditions for many micro-competitors d. Easy access to bloodstream