Tall stem (T) is dominant and short stem (t) is recessive. Green pods (G) is dom
ID: 8330 • Letter: T
Question
Tall stem (T) is dominant and short stem (t) is recessive.Green pods (G) is dominant and yellow pods (g) are recessive.
Smooth seeds (S) are dominant and wrinkled (s) are recessive.
Suppose a homozygous short, green, wrinkled pea planti is crossed with a homozygous tall, yellow, smooth plant.
What is the appearance of the F1 generation?
If they are interbred, what will be the appearance of F2?
what will be the appearance of the offspring of a cross of the F1 back to the short green wrinkled pea?
back to the tall yellow smooth parent?
Explanation / Answer
Tall stem (T) is dominant and short stem (t) is recessive.
Green pods (G) is dominant and yellow pods (g) are recessive.
Smooth seeds (S) are dominant and wrinkled (s) are recessive.
Suppose a homozygous short, green, wrinkled pea planti is crossed with a homozygous tall, yellow, smooth plant.
homozygous short, green, wrinkled pea plant-------------- -------------ttssGG
homozygous tall, yellow, smooth plant.--------------------------------TTggSS
What is the appearance of the F1 generation?
homozygous short, green, wrinkled pea plant ttssGG X homozygous tall, yellow, smooth plant TTggSS
GAMETES ------------------------------ tsG , TgS
F1 generation-------------Tt Gg Ss TALL GREEN SMOOTH
If they are interbred, what will be the appearance of F2?
Tt Gg Ss TALL GREEN SMOOTH X Tt Gg Ss TALL GREEN SMOOTH
PHENOTYPIC RATIO --------------27:9:9:9:3:3:3:1
what will be the appearance of the offspring of a cross of the F1 back to the short green wrinkled pea?
back cross
F1 generation-------------Tt Gg Ss X ttGGss
T G S tGs
T G s tGs
T g S tGs
T g s tGs
t G S tGs
t G s tGs
t g S tGs
t g s tGs
Trihydrid teat cross ratio 1 : 1 : 1 : 1 : 1 : 1 : 1 : 1
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