In certain cattle, hair color can be red (Homozygous R1R1), white (R2R2), or roa
ID: 178931 • Letter: I
Question
In certain cattle, hair color can be red (Homozygous R1R1), white (R2R2), or roan (a mixture of red and white hairs, R1R2). What type of expression is occurring? When a red bull is mated to a white cow, what genotypes and phenotypes of offspring could be obtained? What are the proportions? In the edible pea tall (T) is dominant to short (t), and green pods (G) are dominant to yellow pods (g). List the types of gametes and offspring that would be produced in the following crosses. TtGg X TtGg TtGg X TTGG TtGg X TtggExplanation / Answer
Answer:
1).
Red: R1R1
White: R2R2
Roan: R1R2
The expression of the colors of the cattle is incomplete dominance.
a).
Red bull (R1R1) x White cow (R2R2)
R1R2 (Roan)
All progen of red bull and whilt cow are roan. The probability of roan is 100%
2).
a). TtGg x TtGg
Each parent produces four types of gamets, i.e., TG, Tg, tG & tg
TG
Tg
tG
tg
TG
TTGG (Tall, green)
TTGg (Tall, green)
TtGG (Tall, green)
TtGg (Tall, green)
Tg
TTGg (Tall, green)
TTgg (Tall, yellow)
TtGg (Tall, green)
Ttgg (Tall, yellow)
tG
TtGG (Tall, green)
TtGg (Tall, green)
ttGG (short, green)
ttGg (short, green)
tg
TtGg (Tall, green)
Ttgg (Tall, yellow)
ttGg (short, green)
ttgg (short, yellow)
(Tall, green) : (Tall, yellow) : (short, green) : (short, yellow)
9 : 3 : 3 : 1
b). TtGg x TTGG
TtGg produces four types of gametes, i.e., TG, Tg, tG & tg.
TTGG produces one type of gametes, TG
The offsprings are TTGG (Tall, Green), TTGg (Tall, Green), TtGG (Tall, Green), TtGg (Tall, Green).
It means all are tall green.
c). TtGg x Ttgg
TtGg produces four types of gametes, i.e., TG, Tg, tG & tg.
Ttgg produces two types of gametes, i.e., Tg & tg.
Tg
tg
TG
TTGg (Tall, Green)
TtGg (Tall, Green),
Tg
TTgg (Tall, yellow)
Ttgg (Tall, yellow)
tG
TtGg(Tall, Green)
ttGg (short, green)
tg
Ttgg (Tall, yellow)
ttgg (short, yellow)
(Tall, Green) : (Tall, yellow) : (short, green) : (short, yellow)
3 : 3 : 1: 1
TG
Tg
tG
tg
TG
TTGG (Tall, green)
TTGg (Tall, green)
TtGG (Tall, green)
TtGg (Tall, green)
Tg
TTGg (Tall, green)
TTgg (Tall, yellow)
TtGg (Tall, green)
Ttgg (Tall, yellow)
tG
TtGG (Tall, green)
TtGg (Tall, green)
ttGG (short, green)
ttGg (short, green)
tg
TtGg (Tall, green)
Ttgg (Tall, yellow)
ttGg (short, green)
ttgg (short, yellow)
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