Suppose that you have discovered a new mutant in Drosophila melanogaster. The trait is known to be sex linked
Which crosses should you perform to determine if the mutant trait is recessive or dominant?
What will be an ideal response?
ANSWER: You should do the following crosses:Cross
a male with the mutant phenotype and a female without the mutant phenotype. If none
of the offspring have the mutant phenotype, the mutant phenotype is likely X-linked
recessive. Alternately, if half of the male offspring and half of the female offspring have the
mutant phenotype, the mutant phenotype is likely X-linked recessive. If none of the male
offspring have the mutant phenotype and all of the female offspring have the mutant
phenotype, the mutant trait is likely X-linked dominant.
Cross a male without the mutant phenotype and a female with the mutant phenotype. If all of the male offspring and none of the female offspring have the mutant phenotype, the mutant
phenotype is likely X-linked recessive. If all of the male offspring and at least 50% of the
female offspring have the mutant phenotype, the mutant phenotype may be X-linked
dominant.
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A. the use of ATP as an energy source to drive primary transport. B. a greater concentration of positive charges on the side of the membrane with the lowest concentration of protons. C. a higher pH on the side of the membrane with the highest concentration of protons. D. a higher pH on the side of the membrane with the lowest concentration of protons. E. a greater concentration of positive charges on the side of the membrane with the highest concentration of protons.
Mendel's monohybrid cross of Tt parents resulted in a tall-to-short ratio of
A. 2:1. B. 1:1. C. 1:2. D. 1:3. E. 3:1.
The club fungi are members of which of the following?
a. ascomycetes b. basidiomycetes c. glomeromycetes d. chytrids e. zygomycetes
The shared genetic code of all life on Earth is evidence that ________
A) the genetic code arose relatively late in the history of life on Earth B) DNA replication is error-free C) all life shares a common ancestry D) bacterial cells arose earlier than eukaryotic cells