Which statement about the X chromosome is correct?
A. The X chromosome carries only the recessive genes in males.
B. X and Y are different in size but carry nearly equal numbers of genes.
C. X chromosome inactivation only occurs in females.
D. The X chromosome carries only gender-related genes.
E. The X chromosome carries the SRY gene.
Answer: C
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Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.
Answer the following statement true (T) or false (F)
Eating undercooked pork or wild game can lead to a potentially fatal infection of ________
a. Trichinella spiralis b. Caenorhabditis elegans c. Wuchereria bancrofti d. Enterobius vermicularis
Honey bees will use ________ signals to alert other members of the hive about the location of a source of food
a. tactile b. chemical c. auditory d. acoustic e. visual
What explains the viability of individuals with aneuploidies for the sex chromosomes?
a. Sex chromosomes carry less information than autosomes. b. The lack of crossing-over between the X and the Y chromosomes. c. Sex chromosomes are smaller than most autosomes.
d. The information on sex chromosomes is duplicated on the autosomes. e. Dosage compensation, by which one X chromosome per cell is inactivated