Researchers have successfully isolated the majority of microbes from their natural habitats and have cultured them in vitro on artificial media to facilitate extensive study.
Answer the following statement true (T) or false (F)
False
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A couple, both carriers of cystic fibrosis (CF) alleles, can decrease their odds of having a child with CF by performing an in vitro fertilization procedure and screening the embryo for the CF alleles. This process is called
A. polymerase chain reaction. B. gene therapy. C. genetic typing. D. preimplantation genetic diagnosis. E. cloning and testing the unborn child.
Polar microtubules
a. overlap in the center of the spindle. b. are attached to the contractile ring. c. are attached to kinetochores. d. pull kinetochores poleward.
Which describes why meiosis promotes genetic variability?
A. Meiosis produces four gametes that have half the same number of chromosomes of the parent cell B. Meiosis produces four gametes that have twice the same number of chromosomes of the parent cell C. Meiosis produces four gametes that have the same number of chromosomes of the parent cell D. Meiosis produces four gametes that have four times the same number of chromosomes of the parent cell
Assume that investigators crossed a strain of flies carrying the dominant eye mutation Lobe on the second chromosome with a strain homozygous for the second chromosome recessive mutations smooth abdomen and straw body. The F1 Lobe females were then
backcrossed with homozygous smooth abdomen, straw body males, and the following phenotypes were observed: smooth abdomen, straw body 820 Lobe 780 smooth abdomen, Lobe 42 straw body 58 smooth abdomen 148 Lobe, straw body 152 Give the gene order of these three loci. A) Lobe, straw, smooth B) it is impossible to tell C) Lobe, smooth, straw D) smooth, straw, Lobe E) smooth, Lobe, straw