Sex Linkage and Incomplete Dominance (Leaving Cert Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is sex linkage?
What is sex linkage?
Gene on sex chromosome
How does the X chromosome compare to the Y chromosome?
How does the X chromosome compare to the Y chromosome?
X is larger with many more genes
Why are males more likely to express X-linked recessive traits?
Why are males more likely to express X-linked recessive traits?
They only have one X chromosome
Which are common examples of sex-linked traits in humans?
Which are common examples of sex-linked traits in humans?
Colour blindness & haemophilia
Which colours are particularly affected in colour blindness?
Which colours are particularly affected in colour blindness?
Red and green
What percentage of males worldwide have some degree of colour blindness?
What percentage of males worldwide have some degree of colour blindness?
About 8%
Can males be carriers for X-linked traits?
Can males be carriers for X-linked traits?
No, they express it or don't have it
If a carrier mother and normal father have a son, what is his haemophilia risk?
If a carrier mother and normal father have a son, what is his haemophilia risk?
50% chance
What is incomplete dominance?
What is incomplete dominance?
Neither allele is fully dominant
What coat colour results from crossing red and white cattle showing incomplete dominance?
What coat colour results from crossing red and white cattle showing incomplete dominance?
Roan (red and white mixture)
What is the F2 phenotypic ratio in incomplete dominance crosses?
What is the F2 phenotypic ratio in incomplete dominance crosses?
1:2:1
How does incomplete dominance ratio differ from complete dominance?
How does incomplete dominance ratio differ from complete dominance?
1:2:1 vs 3:1 ratio