Q.23) A locus in mice is involved in pigment production; when parents heterozygous at this locus are mated,3/4 of the progeny are colored and 1/4 are albino. another phenotype cocerns coat color; when two yellow mice are mated,2/3 of the progeny are yellow and 1/3 are agouti. the albino mice cannot express whatever alleles they have at the independent assorting agouti locus.
a)when yellow mice are crossed with albino,they produce F1 mice consisting of 1/2 albino,1/3 yellow,and 1/6 agouti.what are the probable genotypes of the parents?
b) if yellow F1 mice are crossed among themsleves,what phenotypic ratio would you expect among the progeny? what proprtion of the yellow progeny produced here would be expected to be true breeding?
Q.12) In peaches, Fuzzy skin (F) is completely dominant to smooth (nectarine) skin (F),and the hetrozygous condition of oval galnds at the base of the leaves (G ^o) and no glands (G^N) gives round glands. A homozygous fuzzy,no-gland peach variety is bred to a smooth,oval-gland variety.
a) what will be appearance of the F1 peaches?
b) what will be the appearance of the F2 peaches?
C) what will be the appearance of the offspring of a cross of the F1 peaches back to that smooth,oval glanded parent?