What is the map distance between the pr and cn genes?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) 20 m.u.
B) 2 m.u.
C) 4 m.u.
D) 46 m.u.
E) 8 m.u.
C) 4 m.u.
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____________________ Indicate whether the statement is true or false.
Mycoplasmas are bacteria that lack cell walls.
a. true b. false
What is an advantage of sexual reproduction over asexual reproduction?
a)genetic variability during an ecological disaster b)genetic variability when the environment is stable c)faster reproduction d)requirement of less energy e)simpler form of reproduction
The following steps occur during multiplication of retroviruses. Which is the fourth step?
A) synthesis of double-stranded DNA B) synthesis of +RNA C) attachment D) penetration E) uncoating