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Cytoplasmic male sterility (CMS) in plants is caused by mutation in the mitochondrial genome. CMS can be restored by a nuclear gene, restorer of fertility (Rf), which is a dominant […]

15. Two petite yeasts, Mat-a and Mat-α are crossed. The diploid is grande. After a few mitotic divisions, the grande diploid is sporulated. The analysis of a large number of […]

A mutant mating type mt strain of Chlamydomonas that was resistant to the antibiotic kanamycin (kanr) and herbicide PPT (pptr) was crossed to a wild type mating mt+ kams ppts […]

During development, many gene products are provided by the females to the eggs which are needed for normal development of the zygote. Such genes are called as maternal-effect genes. The […]

12. In Drosophila, a cross was set between a male homozygous for alleles S+/S+ (phenotype A) and a female homozygous of S/S (phenotype B) (‘S+‘ being a dominant allele and […]

11. A male snail homozygous for dextral alleles is crossed with a female homozygous for sinistral alleles. All the F1 individuals showed sinistral phenotype. When F1 progeny snails were self-fertilized […]

10. Maternal inheritance of coiling of shell in snail (limnaea peregra) is well established. The dextral coiling depends on dominant allele D and sinistral coiling depends upon recessive allele d. […]

9. In Neurospora, the mutant stp exhibits erratic stop-and-start growth.  When a female of stp strain is crossed with a normal strain acting as a male, all progeny individuals showed […]