The trait of medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are P'P'. A cross is made between two plants each with medium-sized leaves
If they produce 80 seedlings, what would be the expected phenotypes, and in what numbers would they be expected? What is the term for this allelic relationship?
20 (large leaves), 40 (medium leaves), 20 (small leaves); incomplete dominance
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Describe the hydrogen hypothesis and why it is favored over other hypotheses
What will be an ideal response?
Populations of all organisms change from one generation to the next because their DNA changes over
time. This is known as:
a. artificial selection. b. biological evolution. c. natural selection. d. artificial selection and natural selection only e. developmental selection.
Insulin and glucagon are produced by a:
A) small proportion of the cells in the pituitary. B) large proportion of the cells in the pancreas. C) large proportion of the cells in the adrenal glands. D) small proportion of the cells in the pancreas.
Which statement is false concerning X chromosome inactivation?
a. It is an accident of evolution. b. It is an example of dosage compensation. c. It is a gene control mechanism. d. It is responsible for the normal development of female embryos. e. It does not occur in males.