Which of the three genes is in the middle?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) px
B) sp
C) cn
D) insufficient data
A) px
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A cell that responds to an environmental condition by the release of a chemical is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices is correct.
Which of the following represents an
monohybrid cross?
a. AA x aa b. Aa x Aa c. AA x AA d. aa x aa e. all of these are monohybrid crosses
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color
The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?
What group of evolutionary biologists tends to focus on the differences between fossils, classifying Homo fossils into four or more species?
A. Bipedalists B. Splitters C. Lumpers D. Hominoids E. Formulationists