Which statement is true of homologous chromosomes?
a. They are of unequal length.
b. Each gamete receives one member of each pair.
c. There are 46 pairs in humans.
d. They are identical in every way.
e. They include all chromosomes except X and Y.
B
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Currently in the United States, approximately ________ couples have difficulty in conceiving or giving birth to children.
A) 1 in 6 B) 1 in 30 C) 1 in 100 D) 1 in 200
This cross is not useful to determine if one of the genes is linked to the others. Which gene?
In peas, tall (T) is dominant to short (t), red flowers (R) is dominant to white flowers (r), and wide leaves (W) is dominant to narrow leaves (w). A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves. The resulting progeny are shown in the table.
A) gene T
B) gene R
C) gene W
D) This cross shows that all three genes are linked.
How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes? What will be an ideal response?
An antigen-MHC complex is usually found on which cell type?
a. neutrophils b. helper T cells c. cytotoxic T cells d. plasma cells e. dendritic cells