Color vision depends on dominant alleles of three different genes: the R gene and the G gene, both on the X chromosome, and the B gene, which is autosomal. Recessive mutant alleles of any one of these three genes can cause color blindness in homozygotes. Suppose a color-blind man marries a color-blind woman and all their offspring have normal vision. What is the genotype of the woman?
A) RR GG bb
B) RR gg BB
C) rr GG bb
D) RR gg BB or RR GG bb
E) rr GG bb or rr gg BB
A) RR GG bb
You might also like to view...
Answer the following statement(s) true (T) or false (F)
1. Animals with pentaradial symmetry have 5 planes of symmetry. 2. All mammals have hair, mammary glands, and a placenta. 3. Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells. 4. If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis. 5. Cavitation would have no effect on translocation.
The hole in the ozone layer is most dramaticover:a
Antarctica. b. North America. c. Asia d. Europe. e. Africa.
Recently, a gene located on chromosome 3 in humans, FHIT, has been shown to be associated with ________
A) Huntington disease B) several types of cancer C) "mad-cow" disease D) XYY/XY mosaicism E) Klinefelter syndrome
The substrate(s) in the MR/VP medium is (are)
A. Peptones B. Tryptophan C. Glucose D. Sucrose E. Lactose