Sex Determination (GCSE Biology)

Which of these best describes haplodiploidy as seen in bees?

Which method could be used to estimate the sex ratio of a wild population of animals without capturing them?

Haemophilia is an X-linked recessive disorder. If a carrier mother (XhX) and a healthy father (XY) have children, what fraction of daughters will be carriers?

In human assisted reproduction, preimplantation genetic testing can be used to select embryos without sex-linked disease. What is one ethical concern about using this to choose sex?

A male with an X-linked dominant condition mates with a normal female. What is the expected outcome for their daughters?

Which statement best explains why sex-linked traits can reveal patterns of inheritance in small pedigrees more clearly than autosomal traits?

A male is color-blind (an X-linked recessive trait) and his wife has normal colour vision but her father was colour-blind. What is the probability their son will be colour-blind?

What term describes the allele or gene found on the X chromosome but not on the Y, causing traits to appear more often in males?

What is the expected sex ratio (male : female) at conception in humans under normal conditions?

Which condition results from an extra X chromosome in males (XXY)?

Which of the following statements about sex-linked recessive traits is correct?