Some of the species of stalk-eyed flies are sexually dimorphic, with males having eye stalks up to twice as long as those in females. This gender difference in eye span results from selection by females on the expression of this trait in males, a process called __________.

#Question id: 2274

#Unit 2. Cellular Organization

Unlike those of prokaryotes, eukaryotic cell walls are composed of

#Question id: 23898

#Unit 13. Methods in Biology

#Question id: 3398

#Unit 11. Evolution and Behavior

Genetic drift in a small population for multiple generations can significantly affect the composition of a population’s gene pool. Following some observation are given for reason of Genetic drift?

A) Small populations are threatened by a loss of genetic variability. This loss may be caused by inbreeding, genetic drift, and limited mating.

B) Sampling error can arise is through the founder effect, which is due to the limited matting within population

C) Genetic drift arises is through a genetic bottleneck, which develops when a population undergoes a drastic reduction in population size.

D) Variance in allele frequency due to genetic drift will be maximal when one allele is very rare and the population size is small.

Which of the above observation are true?

#Question id: 34100

#Unit 3. Fundamental Processes

#Question id: 28532

#Unit 5. Developmental Biology

Which of the following gene is necessary for the normal formation of basal elements such as the root and hypocotyl, encodes an auxin response transcription factor ?