Crossing-over requires:
a. the physical exchange of parts of homologous chromosomes.
b. chromosome duplication during meiosis.
c. the fusion of gametes to restore the diploid number of chromosomes.
d. A and B.
e. None of the above.
D
You might also like to view...
Describe the main structural characteristics of the four basic tissues.
(a) Epithelial tissue: (b) Connective tissue: (a) Muscle tissue: (b) Nervous tissue:
The __________ gland produces hormones and is the site where __________ (a kind of white blood cell) mature.
Fill in the blank(s) with the appropriate word(s).
For the following questions, choose the letter from the list below that best matches the description (please note the answer should be a single upper case letter):A. DesertB. SavannaC. TaigaD. Temperate grasslandE. Tropical rain forestRestricted by water availability; 20 degrees to 30 degrees latitude; hot sunny days, cold nights; annuals; shrubs with long roots; succulents.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about the Ey transcriptional regulator is false?
(a) Expression of Ey in cells that normally form legs in the fly will lead to the formation of an eye in the middle of the legs. (b) The Ey transcription factor must bind to the promoter of every eye-specific gene in the fly. (c) Positive feedback loops ensure that Ey expression remains switched on in the developing eye. (d) A homolog of Ey is found in vertebrates; this homolog is also used during eye development.