Imagine that fur length in a chinchilla species is a polygenic trait controlled by at least three genes. For each of these genes, long fur (PL, QL, or RL) has incomplete dominance over light (PS, QS, RS). A chinchilla homozygous for long fur is mated with a chinchilla that is homozygous for short fur. What will be true of their offspring?
A. 1/4 will be homozygous for long fur, 1/4 will be homozygous for short fur, and 1/2 will be heterozygous.
B. 1/2 of their offspring will have long fur, 1/2 of their offspring will have short fur.
C. 1/2 of their offspring will be homozygous for long fur, 1/2 of their offspring will be homozygous for short fur.
D. All of their offspring will have intermediate-length fur.
E. All of their offspring will have long fur.
D. All of their offspring will have intermediate-length fur.
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Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer or more than this have reduced fitness. Which of the following terms best describes this situation?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
Arrange the following genetic terms in order from smallest to largest
A. gene; DNA strand; chromosome; genome B. genome; gene; chromosome; DNA strand C. DNA strand; chromosome; Gene; Genome D. DNA strand; Gene; Genome; Chromosome E. Gene; Chromosome; DNA strand; Genome
Which one of these is a nitrite?
a. NH4- b. NO3- c. NO2- d. PO4- e. NH2
In a multicellular organism like an animal or a plant, it is cell-to-cell communication that allows the trillions of cells in an organism to coordinate life-dependent activities. To do this, cells within an organism exchange cellular molecules, including RNA. In plants specifically, this exchange can trigger acclimation to environmental changes, transfer of nutrients, and growth. Why is this study important?