Biology 1100 - Principles of Biology » Fall 2019 » Week 12 Quiz

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Question #1
You are studying the genetics of a species where males are ZZ (the 2 sex chromosomes are homologous) and females are ZW (the 2 sex chromosomes are NOT entirely homologous.) Dosage compensation (to have even expression of genes on sex chromosomes) in this species could be achieved if ____.
A.   Females double the expression of genes on the Z chromosome in each cell.
B.   Females inactivate the W chromosome in each cell.
C.   Females inactivate either the Z chromosome or the W chromosome in each cell.
D.   Males double the expression of genes on the Z chromosome in each cell.
Question #2
Inspired by Mendel's garden, you decide to grow some pea plants.  After a first successful season eating fresh peas, you decide to save the seeds from your favorite plant, which you name Seymour.  What proportion of offspring plants are expected to share the same mitochondrial DNA as Seymour?
A.   0.75
B.   0
C.   0.25
D.   1
Question #3
When one gene affects more than one single trait, this is called _______.
A.   pleiotropy
B.   incomplete dominance
C.   polygenic inheritance
D.   codominance
Question #4
A trait with ______ has a different, distinct phenotype for each genotype.
A.   codominance
B.   polygenic inheritance
C.   multiple alleles
D.   incomplete dominance
Question #5
You are interested in having an orange male cat named Garfield.  A black male cat and a tortoiseshell female cat have a litter together.  What proportion of the offspring do you expect to be orange male cats?
A.   1
B.   0.5
C.   0.25
D.   0
Question #6
A polyploid individual has _______.
A.   a greater chance of having a recessive phenotype
B.   a greater chance of survival
C.   cancer
D.   at least three alleles for every gene

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