Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. What is/are the possible genotype(s) of person 4?
A) AA
B) Aa
C) Either AA or Aa
D) aa
E) Cannot be determined
B) Aa
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Testosterone is synthesized primarily by the _____
A) sperm cells B) hypothalamus C) Leydig cells D) anterior pituitary gland E) seminiferous tubules
The peptides presented by MHC class II peptide molecules are
A. from plasma cells. B. exogenous antigens. C. endogenous antigens. D. from T helper cells.
Blood returning to the mammalian heart in a pulmonary vein will drain first into the
A. left atrium. B. right ventricle. C. right atrium. D. vena cava. E. left ventricle.
Which of the following would occur if there was no chiasma formation in prophase I?
A) All gametes would have the same phenotype. B) All gametes would have the same genotype. C) Mosaic chromosomes would form. D) In a heterozygote, there would only be a 2:2 formation after meiosis II, never a 1:1:1:1. E) In a heterozygote, there would only be a 1:1:1:1 formation after meiosis II, never a 2:2.