A population of people who have lived in the middle of the jungle for thousands of years without coming in contact
with other individuals would show evidence of:
a. genetic stasis.
b. polymorphism.
c. random mating.
d. genetic equilibrium.
e. increasing non-harmful alleles.
d
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Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Hershey and Chase B. Chargaff C. Franklin D. Watson and Crick E. Meselson and Stahl
Which of the following proteins is NOT required for homologous recombination?
A) Hfr B) RecA C) proteins having helicase activity D) endonuclease
Turner Syndrome (XO) is the only viable monosomy found in humans. Some sex chromosome trisomies are also viable, including XXX, XXY, and XYY. There are no viable autosomal monosomies, and a small handful of viable
autosomal trisomies exist, such as trisomy 21 (Down syndrome), and trisomy 13 and 18, both of which are lethal within the first year of life. Clearly, aneuploidy is not tolerated well in humans. Speculate as to why there are so few viable monosomies (only one) in humans, and why there are so few viable trisomies. Also, speculate as to why aneuploidy involving the sex chromosomes is better tolerated than those involving autosomes.
What will be an ideal response?Birds differ from earlier vertebrates by
a. their lack of scales. b. producing land eggs. c. the ability to maintain a constant body temperature through metabolic activities. d. the ability to fertilize eggs internally. e. their possession of a dorsal nerve cord.