Dd is crossed with a Dd. Squres labeled clockwise from top left
Which of the plants will br true-breeding?
A) 1-4
B) none
C) 1 only
D) 2 and 3
E) 1 and 4 - E) 1 and 4
What is the difference between a monohybrid cross and a dihybrid cross?
A) A monohybrid cross produces single progeny, whereas a dihybrid cross produces two progeny
B) A monohybrid cross is erformed only once, whereas a dihybrid cross is performed twice
C) A monohybrid cross involves organisms that are heterozygous for a single character whereas a
dihybrid cross involves organisms that are heterozygous for two characters
D) a monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents
E) a monohybrid cross results in a 9:3:3:1 ratio, whereas a dihybrid cross gives a 3:1 ratio - C) a
monohybrid cross involves organisms that are heterozygous for one character, whereas a dihybrid cross
involves organisms that are heterozugous for two characters
A cross between homozygous purple-flowered and homozygous white-flowered peas results in offspring
with purple flowers. This demonstrates
A) dominance
B) the blending model of genetics
C) the mistakes made by Mendel
D) a dihybrid cross
E) true-breeding - A) dominance
, When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to eachother, the F2 generation
included both red and white eyed flies. Remarkably, all the white-eyes flies were male. What was the
explaination for the result?
A) the involved gene was on the Y chromosome
B) other male-specific factors influence eye color in flies
C) the involved gene was on an autosome
D) the involved gene was on the X chromosome
E) other female- specifie factors influence eye color in flies - D) the involved gene wason the X
chromosome
Whish of the following is (are) true for alleles?
A) they can be identical or different for any given gene in a somatic cell
B) they can represent alternative forms of a gene
C) they can be dominant or recessive
D) only A and B are correct
E) A, B, and C are correct - E) A, B, and C are correct
How many unique gametes could be produced through independent assortment by an individual with
the genotype AaBbCCDdEE?
A) 4
B) 64
C) 8
D) 16
E) 32 - C) 8
Given the parents AABBCc x AabbCc, assume simple dominance and independent assortment. What
porportion of the progeny will be expected to phenotypically resemble the first parent?
A) 3/8
B) 1/8
C) 1/4
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