Parapatric speciation occurs most often
a. within in the same home range.
b. when a population extends across different
habitats within the same home range.
c. within a group of interbreeding populations.
d. on either side of geographic barriers.
e. by polyploidy.
B
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Using the techniques of genetic engineering, you design a cytoplasmic protein you want to accumulate within the ER of yeast cells. To accomplish this goal, you need to
A) do nothing; all proteins go through the ER. B) incorporate the appropriate mannose-6-phosphate groups. C) incorporate the appropriate DNA sequence with the proper signal. D) incorporate radioactive amino acids into the protein. E) incorporate the appropriate lipid groups into the lipoprotein.
With the sequence of the gene-coding regions of the human genome in hand and the development of newer sequencing methods, scientists ____
a. now know that the types of mutations present in all cancers are very similar b. can now sequence and analyze the protein-coding genes in cancer cells c. are still unable to systematically identify all the mutations present in a cancer cell d. found that the number of mutational events that occur during the transition from normal to malignant cells is much smaller than previously thought e. found that most tumors had at least 100 mutations in common with any other tumor, emphasizing the common origin of cancer
If short hair (L) is dominant to long hair (l), animals
LL and Ll have the same a. parents. b. genotypes. c. phenotypes. d. alleles. e. genes.
Humans have two sex chromosomes that are named based on their shape. Males have (an) ________ and females have (an) ________.
A. two X chromosomes; X and Y chromosome B. two X chromosomes; two Y chromosomes C. X and Y chromosome; two X chromosomes D. two Y chromosomes; two X chromosomes