In Drosophila, assume that the gene for scute bristles (s) is located at map position 0.0 and that the gene for ruby eyes (r) is at position 15.0. Both genes are located on the X chromosome and are recessive to their wild-type alleles
A cross is made between scute-bristled females and ruby-eyed males. Phenotypically wild-type F1 females were then mated to homozygous double mutant males, and 1000 offspring were produced. Give the phenotypes and frequencies expected.
scute = 425; ruby = 425; wild-type = 75; scute-ruby = 75
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Experiments have shown that even if it is supplied by no other means, plants near the ocean can get enough of the
essential micronutrient ____ from the air, and plants can also get this essential micronutrient from sweat from a person’s hands.
a. sulfur b. manganese c. chlorine d. magnesium e. sodium
Why are adhering junctions common in tissues subject to constant abrasion or stretching, such as skin?
a. These cells need to communicate by allowing cytoplasm to flow between adjacent cells. b. The cells in these tissues require strong cell-to-cell junctions to hold them together. c. Adhering junctions prevent harsh enzymes from flowing between adjacent cells.
d. These tissues do not have basement membranes. e. Adhering junctions allow production of a protective cuticle.
The mutated gene that causes cystic fibrosis is ____
a. CFTR b. CRFT c. CTFR d. CRTF e. CFRT
In humans, an X-linked disorder called coloboma iridia (a fissure in the iris) is a recessive trait. A
normal couple has an afflicted daughter. The husband sues the wife for divorce on the grounds of infidelity. Would you vote in his favor? What will be an ideal response?