The mutation or deletion of Hox genes in fruit flies causes:
A. embryonic lethality.
B. appearance of abnormal body appendages.
C. appearance of normal body appendages at inappropriate body positions.
D. None of the choices is correct.
C
You might also like to view...
The insect symbiont Wolbachia can be used to suppress disease transmission by mosquitoes because
A) Wolbachia supplies essential nutrients to the mosquito Culex quinquefasciatus. B) only Wolbachia-infected mosquitoes can transmit viral diseases such as dengue fever. C) Wolbachia infections can spread rapidly through a mosquito population, killing all the mosquitoes. D) Wolbachia-infected male mosquitoes sterilize uninfected female mosquitoes.
How do you explain this result?
You are trying to improve growth in an economically important fish species. These fish have a gene for large size with two alleles (L,l). You cross a large female (LL) with a small male (ll) and get all large fish! The genotypes of the F1 are 100% Ll, so you assume that large size is dominant to small. You then cross a small female with a large male and get all small fish! The genotypes of this F1 are normal. A. The gene for large size is a maternal effect gene. B. L is not dominant to l. C. The gene for large size is a sex-linked gene. D. L is dominant to l. E. The gene for large size is a maternal effect gene and L is dominant to l.
A cnidarian, which is radially symmetrical, has ________ germ layer(s)
A) no B) one C) two D) three E) four
Which of the following equations represents the total water potential of a plant?
A. ?w = ?p + ?s B. ?s = ?p + ?w C. ?w = ?p _ ?s D. ?p = ?w + ?s E. s2 + p2 = w2