Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A white-eyed female fruit fly is mated to a red-eyed male. One of their hundreds of female progeny is white-eyed. This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during ________ in the ________.

A) meiosis I; mother
B) meiosis II; mother
C) meiosis I; father
D) meiosis II; father
E) meiosis I or II; mother


E) meiosis I or II; mother

Biology & Microbiology

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At the center of an herbaceous eudicot stem is:

a. pith. b. collenchyma. c. sclerenchyma. d. vascular cambium. e. phloem.

Biology & Microbiology

In the 1950s, experiments on rats seemed to suggest that eating behaviour is controlled by two different regions of the hypothalamus:

What will be an ideal response?

Biology & Microbiology

Of the nutrients needed for plant growth, active uptake of ________ regulates turgor pressure within cells of leaves.

A. carbon dioxide B. nitrogen C. oxygen D. ions

Biology & Microbiology

What is another name for "reducing sugars?"

What will be an ideal response?

Biology & Microbiology