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Question
Which one of the following types of inheritance is linked only to males?
Which one of the following types of inheritance is linked only to males?
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Solution
The correct option is C Holandric inheritance
Holandric genes are the inheritance of genes on the Y chromosome. Since only males normally have a Y chromosome, only Y-linked genes can be transmitted from father to son.
Research on specific genes that might be Y-linked (holandric) is still on, but a good number of genes are known to be Y-linked for example SRY (sex-determining region), AZF2 (azoospermia factor 2), TSPY (testis-specific protein), TDF (testis determining factor), etc.
Cytoplasmic inheritance is the transmission of genes that occur outside the nucleus. It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplasts. These two autonomous cell organelles have their own genetic material. The gamete which contributes the cytoplasm in zygote is only egg. Male gametes bring only nuclear material. There is no cytoplasm that is contributed by the male gamete. That means whatever cytoplasm is present in zygote is contributed by the female gamete. Here cytoplasmic inheritance comes from the mother i.e., maternal side, that’s why it is also termed as maternal inheritance. This type of inheritance is also referred to as 'extranuclear inheritance'.
Nuclear chromosome is a broad term referring to all those chromosomes that encode the nuclear genome and are found in the nucleus of a eukaryotic cell during the cell cycle phases when the nucleus is intact. Nuclear inheritance takes place from genes present on the chromosomes of nucleus.
Blending inheritance was a theory of inheritance that predates Mendelian view of inheritance. It stated that a progeny is the average mix of the characteristics of the parents wherein the two traits/characteristics blended together.
Holandric genes are the inheritance of genes on the Y chromosome. Since only males normally have a Y chromosome, only Y-linked genes can be transmitted from father to son.
Research on specific genes that might be Y-linked (holandric) is still on, but a good number of genes are known to be Y-linked for example SRY (sex-determining region), AZF2 (azoospermia factor 2), TSPY (testis-specific protein), TDF (testis determining factor), etc.
Cytoplasmic inheritance is the transmission of genes that occur outside the nucleus. It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplasts. These two autonomous cell organelles have their own genetic material. The gamete which contributes the cytoplasm in zygote is only egg. Male gametes bring only nuclear material. There is no cytoplasm that is contributed by the male gamete. That means whatever cytoplasm is present in zygote is contributed by the female gamete. Here cytoplasmic inheritance comes from the mother i.e., maternal side, that’s why it is also termed as maternal inheritance. This type of inheritance is also referred to as 'extranuclear inheritance'.
Nuclear chromosome is a broad term referring to all those chromosomes that encode the nuclear genome and are found in the nucleus of a eukaryotic cell during the cell cycle phases when the nucleus is intact. Nuclear inheritance takes place from genes present on the chromosomes of nucleus.
Blending inheritance was a theory of inheritance that predates Mendelian view of inheritance. It stated that a progeny is the average mix of the characteristics of the parents wherein the two traits/characteristics blended together.
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