ZW sex-determination system

The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors including Komodo dragons. It is also used in some plants where it has probably evolved independently on several occasions. The letters Z and W are used to distinguish this system from the XY sex-determination system. In this system, females have a pair of dissimilar ZW chromosomes, and males have two similar ZZ chromosomes. In contrast to the XY sex-determination system and the X0 sex-determination system, where the sperm determines the sex, in the ZW system, the ovum determines the sex of the offspring. Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW). The Z chromosome is larger and has more genes, like the X chromosome in the XY system. Question: In chickens, congenital baldness is a Z linked recessive trait. A bold rooster is mated with a normal hen. The F1 from this cross are interbred to produce the F2. Give the genotypes and phenotypes and proportions among the F1 and F2 progeny. #NikolaysGeneticsLessons #ZZZWSystem #Inheritance #sperm #SexLinkedTraitsInBirdGenetics #Autosomal #Phenotype #gene #Cancer #sexlinkedTraits #sexChromosomes #ZChromosome #GeneticsLecture #ovum #SexDetermination #birdsGenetics #ZWSexdeterminationSystem #XYSexdeterminationSystem #hen #rooster #heterogametic #homogametic #ZZ #ZW #Chromosome #allele #ZZSEXDETERMINATION #GenderDetermination #sex #chromosomesAndGenes #geneticsClass12 #geneticsBiology