Question

How is inheritance of chloroplast genomes determined in Chlamydomonas?

Both parents make an equal chloroplast genome contribution to the zygote. A chloroplast gene specifies the uniparental inheritance of the chloroplast genome from the mt+ parent.
	Both parents make an equal chloroplast genome contribution to the zygote. The chloroplast genome is biparentally inherited and offspring are heteroplasmic.
	The mt+ (mating-type plus) gamete is much larger than the mt- (mating-type minus) gamete. Therefore, only the mt+ parent contributes chloroplast genomes to the zygote.
	The nuclear mating-type (mt) locus specifies inheritance of chloroplast genomes. Both parents make an equal chloroplast genome contribution to the zygote. Only the genome contributed by the mt+ (mating-type plus) parent is maintained.

Answer 1

Answer: Option D is correct
Explanation:
In Chlamydomonas, the mt locus determines the inheritance of plastome.
Both parents transmit their plastome to the zygote. However, only the mt+ plastome is maintained while the mt- plastome is actively eliminated.

Plastome = Chloroplast genome
Chloroplast genome size in Chlamydomonas = 203 kb
It codes for 99 genes.