Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. If these genes are not linked, what should be the phenotype ratio of the offspring produced by a testcross (RrTt ? rrtt)?
a. 1 red-eyed with thumbs: 1 yellow-eyed without thumbs
b. 9 red-eyed with thumbs: 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thumbs
c. 3 red-eyed with thumbs: 1 yellow-eyed without thumbs
d. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs
Answer: d. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs
You might also like to view...
A key disadvantage to having an exoskeleton is ____
a. muscles do not work effectively b. the body tissues are unprotected by it c. it does not grow with the animal d. it prevents the possibility of flying e. it breaks easily
In the cotransport of glucose and sodium ions:a
glucose molecules are transported down their concentration gradient. b. sodium ions are transported down their concentration gradient. c. the transport of glucose powers the transport of sodium. d. ATP causes a conformational change in the carrier protein. e. an antiport carrier protein is involved
Which of the following is not an advantage of uric acid excretion in terrestrial animals?
a. Uric acid can be excreted as a paste, thereby conserving water. b. Uric acid is not toxic and can be safely stored. c. Uric acid can be stored in the eggs of animals without harm to the embryos. d. Uric acid is soluble in water and can be easily excreted. e. Uric acid can be excreted along with feces in some animals.
In photosynthesis, the chemiosmotic production of ATP
A) requires oxygen. B) is similar to the production of ATP in mitochondria. C) is done by the Calvin cycle. D) is a result of the oxidation of glucose.