Biology Chapter 15 - The Chromosomal Basis of Inheritance 

Thank you 🙏🏻

I was confused over the same thing as well. Only one female is a carrier, or bears the recessive allele

because there are two females and one of them is a carrier, making it 50 percent

A carrier by definition is a female that has a recessive allele but does NOT express the recessive phenotype. Her phenotype is normal or dominant-looking and her genotype is heterozygous (XNXn). She can pass the recessive (Xn) on to her offspring. Only 1 of the 2 females had this so that is 50% of the females are carriers. Also, be careful of wording with these questions. The question asks what percentage of females are carriers vs. what percentage of OFFSPRING (which includes males) are carriers. 50% of females are carriers, while 25% of offspring (1/4) are carriers (no males can be carriers of X-linked recessive alleles bc they only have one X chromosome).

of course i never miss an upload

I had to look up what NEET is - yes there is A LOT of overlap. I'll definitely make lectures for that syllabus content in the future. It will be a little while before they are made though. Best of luck in your preparations!