Sex Linkage and Incomplete Dominance (Leaving Cert Biology): Quizzes
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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?
Trait controlled by gene on sex chromosome
Why are most sex-linked traits X-linked?
Why are most sex-linked traits X-linked?
X chromosome is larger with more genes
Why do males express X-linked recessive traits more than females?
Why do males express X-linked recessive traits more than females?
Males have only one X chromosome
How many copies of a recessive allele does a female need to show an X-linked recessive trait?
How many copies of a recessive allele does a female need to show an X-linked recessive trait?
Two copies (one on each X)
Which colours does colour blindness typically affect?
Which colours does colour blindness typically affect?
Red and green
How many possible genotypes can males have for an X-linked trait?
How many possible genotypes can males have for an X-linked trait?
Two
What's the chance a male has haemophilia if mother is carrier, father normal?
What's the chance a male has haemophilia if mother is carrier, father normal?
50%
Can males be carriers of X-linked traits?
Can males be carriers of X-linked traits?
No, they either have it or don't
What is incomplete dominance?
What is incomplete dominance?
Both alleles expressed simultaneously
What coat colour results from Rr genotype in cattle showing incomplete dominance?
What coat colour results from Rr genotype in cattle showing incomplete dominance?
Roan (intermediate)
What phenotypic ratio appears in F2 generation of incomplete dominance crosses?
What phenotypic ratio appears in F2 generation of incomplete dominance crosses?
1:2:1
How does the F2 ratio in incomplete dominance differ from complete dominance?
How does the F2 ratio in incomplete dominance differ from complete dominance?
1:2:1 vs 3:1 - all genotypes distinct