Which of the following is the correct sequence through which early development proceeds?
a. morula ? zygote ? gastrula ? blastula
b. zygote ? blastula ? morula ? gastrula
c. zygote ? blastula ? gastrula ? morula
d. zygote ? gastrula ? blastula ? morula
e. zygote ? morula ? blastula ? gastrula
E
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Modern humans evolved about
(a) 200,000 years ago. (b) 2,000,000 years ago. (c) 2,000,000,000 years ago. (d) 4,600,000,000 years ago.
A white cow was mated with a red cow, and they had an offspring who was roan – the calf had an even mixture of white hairs and red hairs covering her body. What is the most likely explanation of the inheritance of the roan coat?
A. red is dominant and white is recessive B. red and white are codominant C. incomplete dominance D. X-linked dominance E. pleiotropy
Hardy-Weinberg states out that original genotype proportions within a population remain constant across generations if certain assumptions were met. These assumptions includeA) the occurrence of random mating. (Select all that apply.)B) the lack of selection.C) the absence of polymorphic loci in the population.D) a large population size. E) an absence of gene flow.
What will be an ideal response?
Many of the regions of the world where hunger is prevalent are also regions with hot and dry climates. What types of agricultural crops would you suggest that these regions attempt to grow?
A) C3 plants, such as wheat and rice B) C3 plants and C4 plants, such as corn and sugarcane C) C3 plants and CAM plants, such as prickly pear and pineapple D) C4 plants and CAM plants