20. Many human recessive genetic diseases are maintained despite continuing sele

ID: 49510 • Letter: 2

Question

20. Many human recessive genetic diseases are maintained despite continuing selection against them because:

a. heterozygotes have a higher fitness than either homozygote.

b. the recessive alleles mutate to dominant type.

c. there is no inheritance for the recessive allele.

d. the dominant allele frequency remain the same over generations.

e. none of the above.

21. Multifactorial traits

a. are affected by both genetic and environmental factors.

b. are continuous

c. vary over a continuous range of measurements

d. are affected by environmental factors such as penetrance and expressivity

e. all of the above

22. siRNAs and miRNAs are produced by:

a. the cleavage of RISCs by endonucleases.

b. the cleavage of functional mRNA within the cytoplasm.

c. the cleavage of pre-mRNA in the nucleus.

d. the cutting and processing of double-stranded RNA by Dicer enzymes.

e. the cutting and processing of double-stranded RNA by Slicer enzymes.

23. The average gene in the human genome is approximately ______ in length.

a. 700 base pairs b. 7000 base pairs c. 17,000 base pairs

d. 27,000 base pairs e. 57,000 base pairs

1. Because heterozygote are more fit than homozygote. As they have both the gene they have better adaptation power

2. All of the above is true.

3.option d is the right answer. These are formed by the cutting of mrna by dicer enzyme

4.e is thr answer

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