In the maternal effect case of shell coiling in Limnaeasnails , a Mendelian cros

Question

In the maternal effect case of shell coiling in Limnaeasnails, a Mendelian cross starting with a dextral(D/D) female and a sinistral (d/d) male yields________ F2s. A. a 3:1dextral:sinistral ratio B. halfdextral and half sinistral C. allsinistral D. alldextral E. None of theabove 15. Cells with more than one mitochondrial genotype are A. homoplasmic. B. polymorphic. C. heterozygous. D. heteroplasmic. E. homozygous. 16. From the Chlamydomonas cross mt+[eryr] × mt-[erys], most of the offspring A. whicheverphenotype is shown by the male parent. B. are matingtype mt+. C. areerythromycin resistant. D. whicheverphenotype is shown by the female parent. E. areerythromycin sensitive. In the maternal effect case of shell coiling in Limnaeasnails, a Mendelian cross starting with a dextral(D/D) female and a sinistral (d/d) male yields________ F2s. Cells with more than one mitochondrial genotype are From the Chlamydomonas cross mt+[eryr] × mt-[erys], most of the offspring In the maternal effect case of shell coiling in Limnaeasnails, a Mendelian cross starting with a dextral(D/D) female and a sinistral (d/d) male yields________ F2s. A. a 3:1dextral:sinistral ratio B. halfdextral and half sinistral C. allsinistral D. alldextral E. None of theabove

Explanation / Answer

1. In the maternal effect case of shell coiling inLimnaea snails, a Mendelian cross starting with a dextral(D/D) female and a sinistral (d/d) male yields________ F2s.    Answer is   (D)    as shell  coiling in Limnaea    is  controlled   by   plasmagenes ( genes presentin cytoplasm ) . As   the zygote  recieves the   cytoplasm from the mother cell  therefore    the progenies will    inherit   the  maternal traits   irrespective  of   the   paternal genome  for   such traits . 2. Cells with more than one mitochondrial genotype are Cells with more than one mitochondrial genotype are Cells with more than one mitochondrial genotype are Answer is   (D) heteroplasmic , plasmagenes  are   genes   present   out the   nucleus i.e. in the   mitochondria or   chloroplast . Therefore   cells with more than one chloroplast genotype are     also heteroplasmic. 3. From the Chlamydomonas cross mt+[eryr] × mt-[erys], most of the offspring From the Chlamydomonas cross mt+[eryr] × mt-[erys], most of the offspring Answer is   (d)   whichever  phenotype is shown by   the  female parent    , the genes   for   the given trait ( erythromycin resistance)    is plasmagenes.

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