How can two pea plants that have different genotypes for seed color be identical in phenotype?
a) one of the two plants could be homozygous for the dominant allele, while the other could be homozygous form the recessive allele
b) one of the two plants could be homozygous for the dominant allele, while the other could be heterozygous
c) genotype has no relation to phenotype
d) seed color in pea plants is not genetically determined
e) one of the two plants could be homozygous for the recessive allele, while the other could be heterozygous
Answer: b) one of the two plants could be homozygous for the dominant allele, while the other could be heterozygous
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Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of ____
a. sulfur dioxide b. nitrogen oxides c. nitrate d. sunlight e. fluoride salts
There are, currently, approximately how many named extant species of plants?
a. 12,000 d. 1,200,000 b. 120,000 e. 2,600,000 c. 260,000
Chromatids are
a. attached at the centriole. b. a pair of chromosomes, one from the mother and one from the father. c. attached to the nuclear envelope. d. identical before and after crossing over occurs. e. identical until crossing over occurs.
The photo below of Australian sawfly caterpillars is used as an example of:
1.Colonial living
2.Pheromone signaling
3.Social defensive behavior
4.Polygamous mating systems