In a particular species of plant, tall vine depends on a dominant gene (T), and
ID: 147543 • Letter: I
Question
In a particular species of plant, tall vine depends on a dominant gene (T), and a pink flower is the result of the heterozygous condition of the genes for red and white flowers (Rr). What fraction of the offspring from the cross of a tall, pink plant (heterozygous for height) with a short, pink plant would be expected to be pink AND tall? A. 3/4 B. 1/2 C. 3/8 D. 1/4 2016 Association of American Medical Colleges (AAMC). All rights reserved. May not be reproduced without prior written permission. MCAT® is a program of the AAMC.Explanation / Answer
TtRr X ttRr
TR
Tr
tR
tr
tR
TtRR
TtRr
Tall, pink
ttRR
ttRr
tr
TtRr
Tall, pink
Ttrr
ttRr
ttrr
tR
TtRR
TtRr
pink
ttRR
ttRr
tr
TtRr
Tall, pink
Ttrr
ttRr
ttrr
4/16 or 1/4
answer is D. 1/4
TR
Tr
tR
tr
tR
TtRR
TtRr
Tall, pink
ttRR
ttRr
tr
TtRr
Tall, pink
Ttrr
ttRr
ttrr
tR
TtRR
TtRr
pink
ttRR
ttRr
tr
TtRr
Tall, pink
Ttrr
ttRr
ttrr
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