In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant: heterozygous: homozygous recessive) would you expect to observe in the offspring?

a. 1:2:1
b. 3:1:1
c. 1:2:0
d. 0:2:1


Answer: c. 1:2:0

Biology & Microbiology

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Biologists captured and marked 120 butterflies, and later captured 150 of which 30 were marked. The population

estimate is 1000 butterflies.

Indicate whether the statement is true or false.

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Most biochemical macromolecules are polymers, which are chains of ________.

A. repeating monomers B. electrolytic molecules C. hydrogen bonds D. hydrophobic molecules E. repeating carbohydrates

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Four of the five answers listed below are the

results of fertilization. Select the EXCEPTION.

a. fruit b. seed c. embryo d. pollen e. endosperm

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What is the atomic mass of the atom identified as A in the accompanying figure?



a. 2 amu
b. 6 amu
c. 8 amu
d. 12 amu
e. 18 amu

Biology & Microbiology