Question

In fruit flies, the grey body colour is dominant to the black, and long wings are dominant to short. On the crossing of a grey, short-winged fly and a black, long-winged fly, produces 25 percent grey, long wing, 25 percent grey, short wing, 25 percent black, short wing, and 25 percent black, long wing, the genotypes of the parental flies is
A)Ggll and GgLl
B)Ggll and ggLl
C)GGll and ggLl
D)GGll and GgLl
E)Ggll and ggLL

Answer 1

In households, restaurants, supermarkets and wherever other food is permitted to rot and ferment, fruit flies are popular. Adults are around 1/8 inch in length and have red eyes in general. The body's front part is tan and black is the rear portion.

Complete answer:
The substance referred to as "elementen" by Mendel is now known as the gene, and it is known that different alleles of a given gene give rise to distinct traits. For example, breeding experiments with fruit flies have shown that fly body colour is determined by a single gene, and that a fruit fly may have either a brown body or a black body. This coloration is a direct product of the alleles of body colour inherited by a fly from its parents.

The gene for body colour in fruit flies has two distinct alleles: the black allele and the brown allele. In addition, the dominant phenotype is brown body colour, and black body colour is the recessive phenotype.

The parents are a grey, short-winged fly and a black long-winged fly, according to the issue. Since grey body colour is dominant over black and long wings are dominant over short, for these recessive traits, the parents are homozygous. The genotype of the grey, short-wing parent is Ggll, and the long-winged fly is ggLl, the black one. The black and grey progeny ratio is 1:1 (25% grey, long wing and 25% grey, short wing: 25% black short wing; and 25% black long wing

Likewise, 1:1 is also the ratio of progeny with short and long wings. 1 dominant gives a cross between heterozygous dominant and homozygous recessive: 1 recessive progeny. This implies that for body colour, the parent fly with grey, short-wings is heterozygous, and for wing length, the parent fly with black, long-wings is heterozygous. Therefore the genotype of the grey, short-wing parent is Ggll and the long-winged fly with black genotype is ggLl.

| GL| Gl| gL| gl
---|---|---|---|---
GL| GGLL| GGLl| GgLL| Ggll
Gl| GGLl| GGll| GgLl| Ggll
gL| GgLL| GgLl| ggLL| ggLl
gl| GgLl| Ggll| ggLl| ggll

Hence, the correct answer is option (B)

Note: In the early 1900s, Thomas Hunt Morgan used the heritable characteristics of a particular fruit fly species, Drosophila mela- nogaster, to extend our understanding of genetics. Morgan was the first to demonstrate that genes were found on chromosomes through experiments.