Question: Which of the following phenomena exhibits criss-cross inheritance?
Options:
Sex-influenced character
Polygamy
Sex-linked character
Sex-quantitative character
Criss-cross inheritance, also called X-linked inheritance, occurs when a recessive trait carried on the X chromosome is expressed in males who only have one X chromosome (inherited from their mother) but not in females who have two X chromosomes (one from each parent). This happens because females have a second X chromosome that can potentially carry a dominant allele, masking the recessive trait.
• Explanation of 📌Other Options:
● a) Sex-influenced character: These are traits influenced by sex hormones but are not directly linked to the sex chromosomes and don't exhibit criss-cross inheritance. For example, pattern baldness in males is influenced by testosterone but not solely determined by X chromosome genes.
● b) Polygamy: This is a mating system where an individual has multiple partners, not an inheritance pattern.
● d) Sex-quantitative character: These are traits influenced by both sex and multiple genes across different chromosomes, not solely by the X chromosome, and don't exhibit criss-cross inheritance. For example, height is influenced by sex and several genes, not just one on the X chromosome.