Question

Which of the following is correct?
A. Henking discovered the small Y-chromosome.
B. Drosophila also shows XX-XY sex-determination like humans.
C. Birds have ZZ-ZW sex determination, where females are ZZ and males are ZW.
D. Grasshoppers show XX-YY sex determination.

Answer 1

Sexual determination results in the formation of individuals with traits that enable them to be categorized as males and females. Female and male mammals are also readily distinguished by several distinctions in their internal and external genetic traits, conduct, and metabolism.

Complete answer: Drosophila flies have chromosomes X and Y, and also autosomes. With exception of humans, Y-chromosomes will not confer masculinity, rather they compile the genes necessary for sperm production. Conversely, sex is defined as the ratio of X chromosomes to autosomes. Each cell ancestry in Drosophila takes a sexual decision all its own. One of the main approaches to illustrate this is by examining XX-XY mosaic flies, i.e. individual flies including a combination of XX and XY cells. Such mosaics reveal a mixture of male and female phenotypes, focusing on the genotype of each cell. The understanding of this variation here is that every Drosophila cell decides its sex independently. Three main genes are involved in the determination of sex in Drosophila. They're sex-lethal, sisterless, and deadpan. Deadpan is an autosomal gene that prevents sex-lethal, whereas the X chromosome is held by the sisterless and prevents the action of the deadpan.

So, the correct answer is an option (B).

Additional information:
Henking has uncovered the X-chromosomes. The work has been the result of a Leipzig research of the firebug testicle, and during that Henking realized that one chromosome did not engage in meiosis. Male grasshoppers are regarded as heterogametic because they create two distinct kinds of sperm cells: both with and without X chromosomes. Female grasshoppers seem to possess XX and grasshoppers will use XX- XO sex-determining system. The ZW sex-determination framework is a chromosome process that determines the sex of descendants in birds, or fish, and crustaceans, such as that of the gigantic river pomegranate, some insects, some invertebrates. In this, women with ZW chromosomes and men with ZZ chromosomes.

Note: Drosophila flies rely on biological evolution, which implies that mating needs male and female flies to produce children. Flies usually participate in courting or mating conduct, in which they copulate. The female then makes eggs, believing that she would eat enough already, and identify the correct medium to lay them.