You discover a new mutation in Drosophila that causes an abnormal wing shape. When a male fly with this mutation is crossed to a homozygous normal female, the F1 are all wild-type phenotypically. The F2 flies consist of 1/2 phenotypically normal females, 1/4 phenotypically normal males, and 1/4 males with abnormal wings. What is the MOST likely explanation for the new mutant allele?
A. It is Y linked.
B. It is X linked and recessive.
C. It is X linked and dominant.
D. It is autosomal and recessive.
E. It is autosomal and dominant.
Ans: B. It is X linked and recessive.
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Club mosses
(a) are placed in the subphylum Pterophyta. (b) are so-called because of the social nature of the plants. (c) do not produce gametophytes. (d) are so-called because most produce strobili.
The fluorochrome method of staining Mycobacterium:
a. is less sensitive than the conventional carbolfuchsin stains. b. enables the smear to be initially examined at lower magnifications. c. results in a lower yield of positive smears. d. increases the amount of time needed for examining smears.
What type of specialized stem do plants such as irises and grasses possess?
a. cladodes b. bulbs c. tubers d. rhizomes e. corms
Which of the boxed subsets of the DNA molecule pictured below consists of a nucleotide?
1.1
2.2
3.3
4.4
5.5