Tetraploid organisms have four copies of each chromosome instead of the two copies that humans have. How many copies of each chromosome end up in a gamete produced by a tetraploid organism?
A) 1
B) 2
C) 3
D) 4
B
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What is the difference between a primary and a secondary source?
A. A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. B. A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. C. A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D. There is no difference between primary and secondary sources.
You are given two true-breeding groups of rabbits. The first group has floppy ears and white coat color. The second group has straight ears and black coat color
When you perform a cross of these two groups to obtain an F1 generation you see that all of your rabbits have floppy ears and grey coat color. Which of the following possibilities appears to be supported by what you see in the F1 generation? A. Straight ears are dominant over floppy ears; white coat color is dominant over black coat color. B. Straight ears are dominant over floppy ears; black coat color is dominant over white coat color. C. Straight ears are dominant over floppy ears; coat color is determined by intermediate dominance. D. Floppy ears are dominant over straight ears; white coat color is dominant over black coat color. E. Floppy ears are dominant over straight ears; black coat color is dominant over white coat color. F. Floppy ears are dominant over straight ears; coat color is determined by incomplete dominance.
The enlarged cell in this image is a Gaucher cell, found in individuals suffering from Gaucher disease. Gaucher cells are actually _____
1.nonfunctional lysosomes containing glucosylceramides
2.lysosomes lacking an active form of one enzyme
3.macrophages lacking an active form of one enzyme
4.nonfunctional macrophages containing glucosylceramides
Human gene therapy
A. includes the insertion of genetic material into human cells for the treatment of a genetic disease. B. has been used in a trial to treat familial hypercholesterolemia. C. has been used for treatment of children who have severe combined immunodeficiency. D. All of the choices are correct.