It is possible for an individual to be genotypically one gender but appear to be the opposite gender. Suppose an individual is genotypically male (XY) but has developed as a female. Explain what has happened and when it might have happened
What will be an ideal response?
Although genotypic sex is determined at conception, the expression of the Y chromosome does not begin until week 6 of development, when the SRY region of the Y chromosome should be expressed in males. If this is not expressed, the individual will develop as a female, which is what occurred in this case.
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Why would a cell ferment rather than respire?
A. There's no oxygen present, and it cannot respire anaerobically. B. It lacks the ability to respire (i.e. no electron transport chain). C. There is no oxygen present and it cannot use anaerobic respiration OR it lacks the ability to respire (i.e., no electron transport chain). D. None of the above.
Which type of microscopy passes light directly through a stained and killed specimen?
a. confocal laser scanning microscopy b. phase-contrast microscopy c. bright field microscopy d. scanning electron microscopy e. fluorescence microscopy
In Morgan's testcross of a gray-bodied, long-winged heterozygous female Drosophila with a homozygous recessive black-bodied, vestigial-winged male, the following offspring were obtained: 965 gray body, long wing; 944 black body, vestigial wing; 206 gray body, vestigial wing; 185 black body, long wing. Focusing only on the recombinant classes (gray body, vestigial wing and black body, long wing), the numbers of offspring of each type are similar (206 and 185). What accounts for the similar number of offspring of each recombinant phenotype?
All of the following are good practices to keep well hydrated during endurance events EXCEPT
a. taking salt tablets and drinking plenty of fluid before the workout. b. drinking freely during the 24 hours before an event. c. consuming 1.5 to 2 cups of fluid 4 hours prior to the event start. d. consuming fluid to replace losses during the workout.