Ova are
(a) male gametes.
(b) female gametes.
(c) specialized for motility.
(d) both a and c.
(b) female gametes.
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The mother of these progeny resulted from a cross between two flies from true-breeding lines. What are the genotypes of these two lines?
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) pr cn+ / pr cn+ and pr+cn / pr+cn
B) pr+cn+ / pr+cn+ and pr cn / pr cn
C) pr+cn+ / pr cn and pr cn / pr cn
D) pr+cn / pr cn and pr cn+ / pr cn
E) More than one of these could be true.
Which of the following is made primarily of protein?
A. skin B. tendon C. enzyme D. carbohydrates
In the genus Caulobacter, asymmetric transverse fission produces a flagellated ________ cell that swims off but eventually settles, ejects its flagella, and forms a ________ that adheres to surfaces.
Fill in the blank(s) with the appropriate word(s).
The fusion of two gametes produces a
A) zygote. B) schizont. C) chromatid. D) centromere. E) merozoite.