21
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Which Punnett square represents a cross between two parents that are heterozygous for purple flowers?
A
A Punnett square is shown. The columns are labeled Upper F and f. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F f, Upper F f, f f.
B
A Punnett square is shown. The columns are labeled f and f. The rows are labeled f and f. Clockwise from upper left the boxes contain: f f, f f, f f, f f.
C
A Punnett square is shown. The columns are labeled Upper F and Upper F. The rows are labeled Upper F and Upper F. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F Upper F, Upper F Upper F, Upper F Upper F.
D
A Punnett square is shown. The columns are labeled Upper F and Upper F. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F Upper F, Upper F f, Upper F f.
22
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The pedigree chart below shows the inheritance of a trait in a family of cats.Which pair of individuals represents a mating that will result in inbreeding?
A
individuals 1 and 6B
individuals 3 and 4C
individuals 3 and 6D
individuals 6 and 1423
The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below. Which of Thomas Hunt Morgan's hypotheses was valid based on these results?
A
White eyes are lethal in female Drosophila.B
White eyes are lethal in male Drosophila.C
Female Drosophila with white eyes are homozygous recessive.D
White eyes are the dominant trait in female Drosophila.24
Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. In the pedigree that is shown, which represents Irene's allele combination?
A
XhXhB
XHXhC
XHXHD
XhY25
Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?
A
An empty circle.
B
A half-filled circle.
C
An empty square.
D
A filled square.
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