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Green (Y) is dominant over yellow (y) in peas, and smooth allele (W) is dominant over wrinkled (w). Which of the following crosses produces green and smooth peas?
A) yyWw × yyWw
B) Yyww × YYWW
C) yyWW×yyWW
D) Yyww × yyww

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Last updated date: 17th Jul 2024
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Answer
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Hint: Dihybrid cross is defined as a cross between two different genes. One of the genes is considered as dominant while the other one is recessive. Here, Y is dominant over y and W is dominant over w.

Complete answer:
Option A-
Male/FemaleyWywyWyw
yWyyWWyyWwyyWwyyww
ywyyWwyywwyyWwyyww
yWyyWWyyWwyyWWyyWw
ywyyWwyywwyyWwyyww

yyWw- yellow smooth
yyWW- yellow smooth
yyww- yellow wrinkled

Option B – this cross is between green- wrinkled seed and green- smooth pea seed.
YyWw- green wrinkled
YYWW- green smooth
YYWw- green smooth
YYWw- green smooth
Male/♀️YwywYWYW
YwyywwYywwYYWwYYWw
ywyywwyywwYyWwYyWw
YWYYWwYyWwYYWWYYWW
YWYYWwYyWwYYWWYYWW

So, the cross shows that the result which is obtained is green and smooth peas. He first worked to obtain a monohybrid cross which has genotypic ratio 3:1 and the phenotypic ratio is 1:2:1. After receiving the successful result with his experiment, he went further to cross two different genes together with the genotypic ratio very long and phenotypic ratio 9:3:3:1.

Option C
yyWW- yellow smooth
Male/FemaleyWyWyWyW
yWyyWWyyWWyyWWyyWW
yWyyWWyyWWyyWWyyWW
yWyyWWyyWWyyWWyyWW
yWyyWWyyWWyyWWyyWW


Option D-
Yyww- green wrinkled
yyww- yellow wrinkled
Male/FemaleYwywywyw
YwYYwwYywwYywwYyww
ywYywwyywwyywwyyww
ywYywwyywwyywwyyww
ywYywwyywwyywwyyww


Note:
The three laws of inheritance are-
1. Law of dominance- One gene is dominant over the recessive gene.
2. Law of segregation – Alleles do not show any blending and both the characters are found as such in the second generation.
3. Law of independent assortment- It says when two pairs of traits are taken together, segregation of the characters is independent of the other pair of characters.