Chromosomes that do NOT determine the sex of an individual are called ________
A) homologous chromosomes
B) nonhomologous chromosomes
C) sex chromosomes
D) autosomes
D
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Maternal PKU can result in serious effects in fetuses. This problem occurs because:a
the fetus is homozygous for PKU and therefore cannot metabolize phenylalanine. b. the fetus is usually homozygous dominant and therefore has PKU. c. the mother is heterozygous for PKU and therefore cannot metabolize phenylalanine. d. the mother is homozygous dominant for PKU and cannot metabolize phenylalanine. e. the mother is homozygous recessive and cannot metabolize phenylalanine
he term "archenteron" refers to the developing:a
gut. b. lung. c. notochord. d. nerve tube. e. skin.
The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the forest?
A) 2.5 trees per hectare B) 5 trees per hectare C) 10 trees per hectare D) 20 trees per hectare E) 25 trees per hectare
Which of the following is the longest lasting type of immunity?
a. an adult receiving antiserum/antitoxin injections b. a body receives antibodies to chickenpox across the placenta c. a person survived an infectious disease d. a baby receives antibodies through breastfeeding