Question

q1: In Anolis lizards, which breed in spring and summer, the ovaries of females begin to enlarge in late winter. Enlargement can be triggered under laboratory conditions by exposing females to

Select one: a. Any of these b. fertile males c. spring-like temperature and light conditions

q2: In Drosophila fruit fly larvae, some individuals tend to move shortly after feeding ("rovers") while others tend to stay close to a food source once they've found it ("sitters"). Compared with sitters, rovers have

Select one:

a. different alleles at multiple genetic loci

b. higher rates of transcription at a single genetic locus

c. different alleles at one genetic locus

d. experienced different environments during a critical window of time after hatching

q3:

Migratory birds are able to navigate using

Select one:

a. the position of the sun

b. the earth's magnetic field

c. the position of the stars

d. All of these

Answer 1

Anwer 1. a. Any of these

The Anolis lizards breed in early summer or sprong due to good abvailability of food. Along with this vicinity of fertile males trigger hormonal cues in the females. Therefore under laboratory conditions these conditions will show such changes in females.

Answer 2. b. higher rates of transcription at a single genetic locus

Allele forR for the rover type and forS for the sitter type explain their genetic makeup. The gene is present on chromosome 2 and explains the foraging behaviour or these flies. Rovers have longer foraging trails than sitters and are able to explore various food patches as compared to sitters.

for encodes for a cGMP kinase protein, and rovers have higher mRNA transcription.

Answer 3 d. All of these

Homing behaviour in birds are mostly associated with the magnetic field of earth. Some proteins in the retinas of birds has been attributed to their sense of magnetic fields. Very small iron concentration in the beak area has also been said to help in navigation by some researchers. Different migratory bird also use the sun and its movement for the position and direction of movement to their destination. Some migratory birds have also been known to use the stars for navigation. Their ability to migrate in day as well as night shows the involvement of celestial bodies like sun and stars to keep track of their movement direction.