On the planet of Caracas, in the Stellar Solorais Ka Chunk Galaxy, there is a po
ID: 318819 • Letter: O
Question
On the planet of Caracas, in the Stellar Solorais Ka Chunk Galaxy, there is a population of Nugget Arians. Two phenotypes of interest are: Peanuts; and Carmelaoid. Each is a single gene trait, and for each gene there are two alleles. A cross between a female with Peanuts and a male with Carmelaoid (each of which is homozygous for the wild-type (non-trait) allele at the other gene) produces the following F1 counts: The mode of inheritance for each phenotype is: Peanuts = Autosomal Recessive. Carmelaoid = Autosomal Dominant. Peanuts = Autosomal Recessive. Carmelaoid = Autosomal Recessive. Peanuts = Autosomal Recessive. Carmelaoid = X-linked Recessive. Peanuts = Autosomal Dominant. Carmelaoid = Autosomal Recessive. Peanuts = Autosomal Dominant. Carmelaoid = Autosomal Dominant.Explanation / Answer
The answer is C. Peanuts=Autosomal Recessive
Carmeloid=X-linked recessive.
As
Autosomal characters of male are not carried to progeny so autosomal inheritance is othrwise called maternal inheritance. As carmelaoid phenotype from male is expressed in F1 so it has to be in cromosome and from the probability of expression it is evident that it is present in X cromosome. The male counterpart like sperm carry very little of cytoplasmic material but half of chromosomal meterial. In human type sex determination i.e.XY male and XX female X linked recessive genes only express in homozygous i.e. XX condition.
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