When genes are located very close together on the same chromosome, ____
a. gametes usually end up with the same combination of alleles as parental cells
b. gametes usually end up with unique combination of alleles
c. they are inherited separately
d. they often recombine during crossing over
e. offspring will look just like one parent
ANSWER: a
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A mutant of Rhizobium leguminosarum is able to survive and reproduce in the laboratory outside of plant roots, but can no longer initiate root nodule formation. What type of genes are most likely mutated in this mutant?
A) rhz genes B) myc genes C) nif genes D) nod genes
In all seed plants, male and female ___________ develop within the parent sporophyte and are completely dependent on it for nutrition and water.
Fill in the blank(s) with the appropriate word(s).
The rough ER is rough because of the presence of
1.proteins. 2.RNA. 3.lipids. 4.ribosomes.
Peas (Pisum sativum) were well suited for Mendel's breeding experiments for all of the following EXCEPT
a) many of the characteristics that vary in pea plants are controlled by single genes b) peas have a particularly long generation time c) peas exhibit variations in a number of observable characteristics, such as flower color and seed shape d) it is easy to obtain large numbers of offspring from any given cross e) Mendel and his staff could control the pollination between different pea plants