You are studying a mutation in a species of butterflies (with ZW sex chromosomes) that causes solid wings instead of spotted wings. Describehow you would use areciprocal crossto test whetherthis trait is sex linked. What result would you expect if the trait is Z linked?What result would you expect if the trait is autosomal?
You are studying a mutation in a species of butterflies (with ZW sex chromosomes) that causes solid wings instead of spotted wings. Describehow you would use areciprocal crossto test whetherthis trait is sex linked. What result would you expect if the trait is Z linked?What result would you expect if the trait is autosomal?
Back Cross -- Aim of back cross -- A back cross is mainly done to improve one or two specific defects of a high yielding variety .
Definition - In back cross method , the hybrid and progenies in subsequent generations are repeatedly back crossed to one of the parents .The genotype of back cross progeny result in similar to that of the recurrent parent .
Application of back cross - The back cross method is used to transfer disease resistance from one variety to another .
It is also used to transfer of other characteristic for eg. Transfer of simply inherited characteristics in intervarietal organisms , interspecific transfer of simply inherited characters ,quantitative characters can also be transfer intervarietal , transfer of cytoplasm .
Procedure of back cross -- The procedure mainly depends on the characteristics of gene , whether is dominant or recessive and the transfer of dominant gene is easily transferred than recessive gene .
Reciprocal Cross -- Aim of reciprocal cross -- Reciprocal cross is a concept of crossing a pair of parents with the sex reversed , resulting in obtaining two reciprocal crosses of which one is another 's reciprocal cross .
Under sexually antagonistic selection , sex - linked traits can be expected to evolve faster than other traits because sex- linked traits almost always differ in their expression in two sexes .
Definition -- A reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern .
Use of reciprocal cross -- Gene influencing traits related to sex and reproduction are several times more likely to be linked to the X chromosome than other trait .
Mainly in genetics of sexually selected traits related with X chromosome .
X chromosome actually have a disproportionate effect on sex and reproduction related traits in organisms specially human and sexually selected traits in animals .
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