In which type of inheritance the results are affected by reciprocal cr...
**Cytoplasmic Inheritance**
Cytoplasmic inheritance refers to the inheritance of genetic traits that are transmitted through the cytoplasm of the cell, rather than through the nuclear DNA. This type of inheritance is observed in certain organisms, such as plants, fungi, and some animals, where genetic information is also contained in the cytoplasmic organelles, such as mitochondria and chloroplasts.
**Reciprocal Cross**
Reciprocal cross is a breeding experiment in which the sexes of the parents are reversed compared to the original cross. For example, if the original cross is between a male A and a female B, the reciprocal cross would involve a male B and a female A. The purpose of reciprocal crosses is to determine if the inheritance pattern is influenced by the sex of the parent.
**Influence of Reciprocal Cross on Cytoplasmic Inheritance**
In cytoplasmic inheritance, the mother's cytoplasm plays a significant role in determining the traits that are inherited. This is because the cytoplasm contains organelles like mitochondria, which have their own DNA. Therefore, in a reciprocal cross, the cytoplasm of the female parent is transferred to the offspring, regardless of the sex of the other parent.
If the traits being examined are influenced by cytoplasmic inheritance, the results of a reciprocal cross will be different. This is because the cytoplasmic factors inherited from the female parent will be different in the two crosses.
For example, let's consider a case where a specific trait is determined by the presence or absence of a certain cytoplasmic organelle or its genetic material. In the original cross, the female parent contributes the organelle and its genetic material, while in the reciprocal cross, the male parent contributes the organelle and its genetic material.
If the trait is present in the progeny of the original cross but absent in the progeny of the reciprocal cross, it indicates that the cytoplasmic factors inherited from the female parent are necessary for the expression of the trait. This demonstrates the influence of reciprocal cross on cytoplasmic inheritance.
Therefore, the correct answer to the question is option B) Cytoplasmic.
In which type of inheritance the results are affected by reciprocal cr...
Cytoplasmic inheritance is defined as the inheritance of characteristics of only one of the two parents, usually the female parent to the progeny. In genetics, a reciprocal cross is a breeding experiment designed to test the role of parental sex on a given inheritance pattern.In one cross, a male expressing the trait of interest will be crossed with a female not expressing the trait. In the other, a female expressing the trait of interest will be crossed with a male not expressing the trait. If some genetical information is also carried in the cytoplasm, the unequal contribution of cytoplasm to the zygote by the two gametes should provide a way of detecting it. The technique used for this is reciprocal cross. Thus, cytoplasmic inheritance results are affected by reciprocal cross. Correct answer is option B.