Crossing over creates new ________
a. combinations of alleles
b. alleles
c. zygotes
d. chromosomes
a
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A heterozygous fruit fly with normal wings and a gray body (VvBb) is crossed with homozygous flies with vestigial
wings and black bodies (vvbb). Out of 800 total F1 progeny, 296 are normal gray, 328 are vestigial black, 99 are normal black, and 77 are vestigial gray. What is the best explanation for this result? a. The loci for wing length and body color are on different chromosomes. b. The loci for wing length and body color are on sex chromosomes. c. The loci for wing length and body color are on the same chromosome. d. Mendel’s principle of independent assortment accounts for this. e. Mendel’s principle of segregation accounts for this
The ______ hair cells are the most important hair cells for our auditory ability
Fill in the blank(s) with the appropriate word(s).
A predator-prey relationship, such as between roadrunners and lizards
a) is usually a cause of extinction of one of the species b) leads to related increases and decreases in the populations of both species c) represents competition between species d) contributes to exponential growth of the predator species
Bacteriophages that integrate into the host's genome do so during a ________ cycle.
Fill in the blank(s) with the appropriate word(s).