If you have screened 100,000 pollen grains and identified 5 mutants, what is the mutation frequency?
What will be an ideal response?
5 × 10–5
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Lining of mouth and anus originate from _____, while lining of the respiratory tract originate from
______.
a. ectoderm; endoderm b. ectoderm; mesoderm c. endoderm; ectoderm d. endoderm; mesoderm e. mesoderm; endoderm
The most general of the pituitary hormones, in that it may affect almost any cell in the body, is
a. the adrenocorticotropic hormone. b. the thyroid-stimulating hormone. c. gonadotropin. d. somatotropin. e. prolactin.
In a cross between a true-breeding plant bearing the dominant traits of smooth, yellow seeds and a true-breeding plant
bearing the recessive traits of wrinkled, green seeds, the offspring (F1) are all smooth and yellow and their genotype is ____. a. SSYY b. ssyy c. SsYy d. ssYY e. SSyy
All of the following can increase the genetic diversity of a population except
A. migration of individuals into a population from another population. B. sexual reproduction. C. asexual reproduction. D. mutation.