Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of
eggs. If normal sperm fertilize these two types, which of the following pairs of genotypes are possible?
a. XX and XY
b. XXY and XO
c. XYY and XO
d. XYY and YO
e. XY and XO
B
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The human leukocyte antigen spans about 4Mbp on human chromosome 6
Indicate whether the statement is true or false.
Antigen presented within Type I MHC molecules will activate T________ cells, while antigens presented within Type II MHC molecules will activate T ________ cells.
A. cytotoxic; helper B. CD4+; CD8+ C. helper; cytotoxic D. regulatory; cytotoxic
________ bonds are responsible for the chemical affinity between A and T (or G and C) nucleotides.
A) Ionic B) Covalent C) Hydrogen D) Hydrophobic
Geneticists use ____ to study the genetics of families through generations
a. Punnett squares b. pedigrees c. karyotypes d. DNA profiles e. fossil analyses