Normally, only female cats have the tortoiseshell phenotype because _____

A) a male inherits only one allele of the X-linked gene controlling hair color
B) the Y chromosome has a gene blocking orange coloration
C) only males can have Barr bodies
D) multiple crossovers on the Y chromosome prevent orange pigment production


A

Biology & Microbiology

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In humans, sex determination generally depends upon

a. whether or not the X chromosome is present. b. the number of X chromosomes present. c. environment in the womb. d. whether or not the Y chromosome is present. e. how many autosomes are present

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In the spiral staircase model of DNA, the rungs

are a. deoxyribose sugars. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate groups. e. composed of all of these

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Which organs are located in the ventral cavity of the body?

A. stomach, liver, heart and spinal cord B. stomach, liver, heart and bladder C. small intestine, brain, lungs and kidneys D. All of the choices are correct. E. None of the choices are correct.

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