1) chicken can have mutant phenotypes that resemble those found in wild birds. H
ID: 260314 • Letter: 1
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1) chicken can have mutant phenotypes that resemble those found in wild birds. Here are two phenotypes in chickens, emus and snowy owls What would happen if you did this cross Male chicken (rooster) from a pure- breeding silky feather strain Feale chicken (hen) from a pure-breeding foot feather strain Assume that the mutations are called Si and Fo, respectively Give the ratios and phenotype of the offspring in each of the following situations Male offsprin Female offspring Situation Si and Fo are alleles of the same autosomal gene and they show co- dominance Si and Fo are both dominant mutations in autosomal genes and these genes are 30 mu apart Si is a dominant mutation in an autosomal gene and Fo is a dominant mutation in a sex linked geneExplanation / Answer
In order to recombination and independent assortment take place, the genes under test must be located more than 30 map units apart from each other so that the chromosomes might undergo proper synapse formation and crossing-over might take place without any steric hinderance. If the genes are located less than 30mu apart from each other, they will be inherited as a single unit as in linked genes. Thus, basedupon this information, the answers for all the three experimental cases can be found as below:
Case 1: All males and females will be containing both the features of male and female parents
Reason: Since the genes are co-dominant in nature, they will be expressed in both male and female offsprings irrespective of their nature of zygosity and dominance behaviour.
Case 2: All male and female offsprings will look similar to their male and female parents.
Reason: According to the information, the genes are located on same chromosome that too only 30 mu apart from each other. Thus, these genes will be linked and all female and male offsprings will inherit both these genes without any crossing over.
Case 3: All the males and females will be silky feathered and feathered-foot.
Reason: Since both the mutations are dominant in nature, the offsprings will inherit both these genes and express them if both the pure-breeding parents have been crossed.
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