In a pine\'s life cycle, hybrid \"l\" pine tree the needles were found to have t

Question

In a pine's life cycle, hybrid "l" pine tree the needles were found to have the alleles LI (heterozygous) producing long needles. In a hybrid "2" pine tree, the needles were found to have the alleles ll (homozygous recessive) producing short needles. If a pollen from hybrid "l" pollinated hybrid "2" to form a hybrid "3" plant which about 50% were long needle and 50% were short needle. Give the genotypes for the following structures found in the life cycles of these plants: Genotype of the pollen grain's nucleus of plant hybrid" Genotype of archegonia of plant hybrid "2"? Genotype of megaspore mother cell of plant hybrid "2"? Genotype of sporophyte of plant hybrid 3" Genotype of microspores of plant hybrid" Genotype of hypocotyl of plant hybrid "3"? Genotype of seed coat of plant hybrid "2" Genotype of ovary of plant hybrid "2" Draw and label the parts of the entire ovule and its content's at maturity (before fertilization) of the two Divisions "angiosperm" and "gymnosperm (pine)". Explain what happens to the various parts of each ovule. Give differences between these two ovules

Explanation / Answer

Genotype of hybrid 1 = Ll

Genotype of hybrid 2 = ll

Parental cross: Ll X ll

Progeny: Ll Ll ll ll

Genotype of pollen grain nucleus of hybrid 1 = (L) or (l)

Genotype of archegonia of hybrid 2 = ll

Genotype of megaspore mother cell of hybrid 2 = ll

Genotype of sporophyte of hybrid 3 = LL or ll

Genotype of microspores of hybrid 1 = (L) or (l)

Genotype of hypocotyls of hybrid 3 = LL or Ll

Genotype of seed coat of hybrid 3 = LL or Ll

Genotype of ovary of hybrid 2 = Gymnosperms contain naked ovule. No ovary walls.

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