Herbicide resistance and Bt genes from GMO
crops are now commonly found in weeds. This
is an example of
a. genetic drift.
b. the bottleneck effect.
c. gene flow.
d. the Red Queen effect.
e. disruptive selection.
C
You might also like to view...
You've likely heard of polar bears (Ursus maritimus) and grizzly bears (Ursus arctos horribilis). Have you hear of a grolar bear or a pizzly bear? These might be unfamiliar because they are the offspring of matings between polar bears and grizzlies
A handful of these animals have been born in zoos; three have been documented in nature. Due to their rarity, only a few grolars (grizzly dad and polar bear mom) or pizzlys (polar bear dad and grizzly mom) have been studied in detail. Their fur color, head shape, and ear shape are striking intermediates between the phenotypes of their parents. It is thought that polar bears originated from a population of brown bears (Ursus arctos) that became geographically isolated during a glaciation event that occurred about 150,000 years ago (Lindqvist et al., 2010). Traditionally the territories of grizzly bears and polar bears did not overlap, as grizzlies ranged from Alaska to Mexico, whereas polar bears stayed on the annual sea ice over the Arctic continental shelf and within the Arctic archipelagos. Relatively recently (last 50 years or so) grizzlies and polar bears have begun to come in contact in the wild. References: Lindqvist, Charlotte; Schuster, Stephan C.; Sun, Yazhou; Talbot, Sandra L.; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P.; Kasson, Lindsay et al. (2010). Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear. PNAS 107 (11): 5053-5057. doi:10.1073/pnas.0914266107. PMC 2814953. PMID 20194737. The origin of polar bears was the result of A. allopatric speciation. B. sympatric speciation. C. peripatric speciation.
A(n) ______ is an organized unit of DNA sequences that enables a segment of DNA to be transcribed into RNA and ultimately results in the formation of a functional product.
A. chromosome B. trait C. allele D. gene E. expression
Pathogenic microorganisms and their hosts live in a close association with one another known as:
A. sociality B. mutualism C. parasitism D. commensalism E. biofilms
The part of the male reproductive system where sperm mature is known as the ____
a. epididymis b. bulbourethral gland c. testis d. seminal vesicle e. ejaculatory duct