Daniel Radcliffe's statements regarding trans women shows he must have "skipped biology class", according to Sky News host Rowan Dean.

Harry Potter star Daniel Radcliffe has spoken out over author JK Rowling's comments about transgender people and said he hopes her remarks have not "tarnished or diminished" fans' experience of her beloved books.

Actor Radcliffe, who became a worldwide star after playing schoolboy wizard Harry in the blockbuster adaptations of the novels, was responding to a series of tweets Rowling posted over the weekend after which critics accused her of being transphobic.

She took issue with the phrasing of a headline for an opinion article about healthcare equality, titled Opinion: Creating a more equal post-COVID-19 world for people who menstruate.'

"'People who menstruate'. I'm sure there used to be a word for those people," she tweeted on Saturday. "Someone help me out. Wumben? Wimpund? Woomud?"

The tweet sparked a debate, with many criticising the writer for appearing to define a woman as someone who has a menstrual period, and accused her of making "anti-trans comments" - which she strongly denied as "nonsense".

Radcliffe waded into the controversy on Monday in a blog post for the LGBT suicide prevention charity The Trevor Project, writing that "trans women are women" and any statement to the contrary "erases the identity and dignity of transgender people."

Mr Dean told Sky News many transgender people do not identify as women, rather as trans-women.

"He obviously skipped his biology lessons," he said.

"He has this fanciable, magical idea that men can be women and women can be men."

''The reality is JK Rowling is correct, I am saying that from my point of view, I am saying it from the point of view of at least three transgender women I know.

All of whom say they are not women...that's them saying that, I'd rather listen to them than listen to an actor trying to curry favour with the cool Hollywood crowd."