Answer:
<h2>Dihybrid cross involves crossing between two traits. Independent assortment is also explained using a dihybrid cross.</h2>
Explanation:
To obtain a phenotypic ration of 1:1:1:1 one of the parent must be heterozygous for both the trait and other parent must be homozygous recessive for both the trait.
If the long winged <em>Drosophila</em> with gray body is dominant then, it is represented by these genotype- LLGG, LlGG, LlGg and LLGg. Short and black <em>Drosophila</em> is considered as recessive (llgg)
Different crosses were carried to obtain a phenotypic ratio of 1:1:1:1.
So, if we cross LlGg with llgg we obtain a phenotypic ratio of 1:1:1:1
we obtain <em>Drosophila</em> which are
Long gray (4)
Long black (4)
Short gray (4)
Short black (4)
So, ratio comes out to be 1:1:1:1