1. For autosomal recessive traits, individuals can express the trait if they hav
ID: 210348 • Letter: 1
Question
1. For autosomal recessive traits, individuals can express the trait if they have only one recessive allele. 1. True 2. False
2. For X-linked recessive traits, individuals can express the trait if they have only one recessive allele. 1. True 2. False
3. For X-linked recessive traits, females express the trait more often than males do because females have two X chromosomes. 1. True 2. False
4. For X-linked recessive traits, males express the trait more often than females do because males have one X chromosome. 1. True 2. False
How would you distinguish nuclear inheritance from extranuclear inheritance?
1. Reciprocal crosses 2. Test Cross 3. Intermating 4. Presence of variable expressivity
Explanation / Answer
1.
For an autosomal recessive trait, individuals can express the trait if they have both the recessive alleles.
Hence the given statement is false.
2.
Yes, for a X linked recessive traits, individuals expresses the trait, if they have only one recessive allele.
Hence the given statement is true.
3.
For X linked recessive traits, males express traits more than females. In females, even though one allele causes disease, other allele is normal for that gene. So the compensation occurs and do not show up the trait, but for males only one allele present on X chromosome shows up as there is no other X chromosome.
Hence the given statement is false.
4.
The given statement is true.
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