Suppose the pair-rule genes were inactivated in Drosophila embryos. What is the likely result of the experiment?
A) The embryos would develop normally.
B) The embryos would lack several segments.
C) The embryos would have impaired anterior-posterior polarity.
D) The embryos would have missing alternate segments.
Answer: D
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NO can only function as a paracrine regulator because____
a. it is hydrophilic and cannot travel free in the blood b. it is hydrophobic and cannot travel free in the blood c. it is rapidly converted into nitrates and nitrites d. its receptors are rapidly turned over e. its receptors are immediately internalized when the ligand binds
Ned is reading his newspaper by holding it at arm's length. Sandra asks him why he isn't holding it closer. He explains that he would not be able to see the print if he held it closer
Which of the following corrective measures would be the best solution for Ned? A) corneal ring segments B) retinal transplants C) convex lenses D) concave lenses
For children 3 years of age and older, the most useful growth charts are
Select one: a. BMI-for-age. b. head circumference and height-for-age. c. weight-for-height and head circumference. d. weight-for-age and height-for-age.
If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn't that allele quickly become extinct in the population?
a. Alleles are never lost from a population. b. The homozygous dominant individuals protect the recessive allele in their genomes. c. The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease. d. The homozygous recessive individuals give their alleles to other individuals before they die from the disease.