In a cross of Ff x Ff, the probability of having a dominant phenotype is
A. 2/3.
B. 1/2.
C. 1/3.
D. 1/4.
E. 3/4.
Answer: E
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Paedomorphosis is
A. the formation of limbs from fins in the evolution of land vertebrates. B. the change from radial to bilateral symmetry in the evolution of plants and animals. C. the retention of juvenile traits in an adult organism. D. an earlier development of adult traits in an organism. E. the development of different types of eyes from a simpler form.
If an organism inherits one dominant and one recessive allele, the phenotype of this organism will look like which of the following?
a. the dominant allele b. the recessive allele c. both the dominant and recessive allele d. neither the dominant or recessive allele
Changes in chromosome number are usually the result of
a. genetic displacement. b. trisomy. c. crossing over. d. nondisjunction. e. disjunction.
Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and
spindly rice plants? a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin