You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?
A. There is no recessive allele for the red pigment gene.
B. There is a mutation in the gene for yellow pigment in the "Jealousy" variety.
C. The environment, and not genes, influences pigment in these rose varieties.
D. There are epistatic interactions between at least two genes for rose pigment.
E. The red allele is dominant to the yellow allele.
Answer: D
You might also like to view...
The bacterium that in part causes acne is
a. Propionibacterium b. Porphyromonas c. Streptococcus d. Lactobacillus e. Clostridium
Many amphibians now face extinction, and one cause is believed to be a(n) __________ fungus. Fill in the blank(s) with the appropriate word(s)
Which is another name for bone cells that remain alive even after the extracellular matrix becomes hardened with calcium phosphate crystals?
A. leukocytes B. fibrocytes C. chrondrocytes D. erythrocytes E. osteocytes
By-products of cellular respiration include
A) NADH and ATP. B) carbon dioxide and ATP. C) FADH2 and NADH. D) carbon dioxide and water. E) oxygen and heat.