Ova are

(a) male gametes.
(b) female gametes.
(c) specialized for motility.
(d) both a and c.


(b) female gametes.

Biology & Microbiology

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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.

Biology & Microbiology

Which of the following is made primarily of protein? 

A. skin B. tendon C. enzyme D. carbohydrates

Biology & Microbiology

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).

Biology & Microbiology

The fusion of two gametes produces a

A) zygote. B) schizont. C) chromatid. D) centromere. E) merozoite.

Biology & Microbiology