Each seed of an orange tree has one embryo from the zygote and three embryos from the nucellus…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Each seed of an orange tree has one embryo from the zygote and three embryos from the nucellus. A student takes seeds.
- How many embryos are in the seeds?
- How many of them have the same genes as the mother plant?
- What per cent of the embryos is this?
Need a reminder? The key ideaShow
The ovary becomes the fruit, and its wall becomes the pericarp. A false fruit includes the thalamus. A parthenocarpic fruit forms without fertilisation. Apomixis makes seeds without fertilisation. In polyembryony, one seed has more than one embryo. A hybrid that is heterozygous for one gene gives heterozygous plants after generations of self-pollination.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. seeds, each with zygotic and nucellar embryos.
Plan. Count the embryos in one seed, then in .
Step 1. All the embryos. .
Step 2. The nucellar embryos. They grow from cells of the nucellus, which have the genes of the mother plant. There are of them.
Step 3. The share. .
Answer: ; ; .
Check. .
Watch out. The zygotic embryo has genes of both parents.
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