5) Phenotypes like height in humans, which show a continuous distribution, are u
ID: 9107 • Letter: 5
Question
5) Phenotypes like height in humans, which show a continuous distribution, are usually the result of
a. an alteration of dominance for multiple alleles of a single gene.
b. the presence of multiple alleles for a single gene.
c. the action of one gene on multiple phenotypes.
d. the action of multiple genes on a single phenotype.
6) A dihybrid cross between a plant with long smooth leaves and a plant with short hairy leaves produces a long smooth F1. If this F1 is allowed to self-cross to produce an F2, what would you predict for the ratio of F2 phenotypes?
a. 9 long smooth: 3 long hairy: 3 short hairy: 1 short smooth
b. 9 long smooth: 3 long hairy: 3 short smooth: 1 short hairy
c. 9 short hairy: 3 long hairy: 3 short smooth: 1 long smooth
d. 1 long smooth: 1 long hairy: 1 short smooth: 1 short hairy
7) You discover a new variety of plant with color varieties of purple and white. When you intercross these, the F1 is a lighter purple. You consider that this may be an example of blending and self-cross the F1. If Mendel is correct, what would you predict for the F2?
a. 1 purple: 2 white: 1 light purple
b. 1 white: 2 purple: 1 light purple
c. 1 purple: 2 light purple: 1 white
d. 1 light purple: 2 purple: 1 white
8) In an organism’s genome, autosomes are
a. the chromosomes that differ between the sexes.
b. chromosomes that are involved in sex determination.
c. only inherited from the mother (maternal inheritance).
d. all of the chromosomes other than sex chromosomes.
Explanation / Answer
5. d the action of multiple genes on a single phenotype ===================== 6 c. 9 short hairy: 3 long hairy: 3 short smooth: 1 long smooth =============== 7.b. 1 white: 2 purple: 1 light purple ============ 8.d. all of the chromosomes other than sex chromosomes.
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