A testcross is always performed between the individual that is heterozygous for the genes to be mapped and an individual who is ____________
A. Heterozygous for the genes
B. Homozygous dominant for the genes
C. Homozygous recessive for the genes
D. Lacking the genes
E. None of the answers are correct
C
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A defect in the transport of ____ ions would have the most direct effect on muscle contraction
a. Cl? b. K+ c. Ca2+ d. Na+Zn2+ e. Zn2+
Sister chromatids separate from each other during _____
A) meiosis I only B) meiosis II only C) mitosis and meiosis I D) mitosis and meiosis II
The earliest known flowering plants date to the
A) Cambrian (early Paleozoic era). B) Triassic (early Mesozoic era). C) Cretaceous (late Mesozoic era). D) Tertiary (early Cenozoic era).
You find a leaf that has large stomata and a thick, waxy covering. What is clear about the original plant?
A) The plant minimizes water loss. B) The plant minimizes nutrient uptake. C) The plant minimizes sunlight uptake. D) The plant maximizes nutrient uptake.