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A week ago Edited: A week ago, billyray
1. Which of the following states a valid conclusion based on the pedigree above?
Select one:
a. Individual I-2 does not carry the red-green colour blindness allele.
b. All children of individuals I-1 and I-2 could be carriers of the red-green colour blindness allele.
c. Individuals II-5 and II-6 are carriers of the red-green colour blindness allele.
d. It is not possible to determine whether individuals III-2 and III-3 are carriers of the colour blindness allele.
e. Individual II-2 passed on the red-green colour blindness allele to individual II-1.

2. Duchenne muscular dystrophy is an inheritable disorder that results in muscle weakness, leading to walking and breathing difficulties and heart disease.

Duchenne Muscular Dystrophy
 

Which of the following is a valid conclusion about the Duchenne muscular dystrophy pedigree shown above?

Select one:
a. Without further evidence, the genotypes of individuals II-2 and III-2 cannot be determined.
b. Individual II-3 can only pass on the affected allele to individuals III-2 and III-4.
c. Only individuals I-2 and II-4 are confirmed carriers of the Duchenne muscular dystrophy allele.
d. Only individuals I-1 and II-3 are confirmed carriers of the Duchenne muscular dystrophy allele.


3. A defective gene on chromosome 15 causes Tay-Sachs disease. It is a central nervous system neurodegenerative disease that most often affects infants, though older children and adults can have late-onset forms of the disease. The defective gene prevents the body from making a protein called hexosaminidase A. Without, hexosaminidase A, chemicals called gangliosides build up in the nerve cells of the brain, destroying brain cells.

A couple has one daughter with Tay-Sachs disease and three other unaffected children. Neither the mother, nor father, nor any of the biological grandparents of the affected daughter have had the disease. Tay-Sachs disease most likely demonstrates what type of inheritance?

Select one:
a. autosomal recessive
b. X-linked recessive
c. X-linked dominant
d. autosomal dominant

4. Achondroplasia is a form of dwarfism caused by a mutation in a single gene. Two individuals with achondroplasia marry and have an affected child and later have a second child that is average in height.

From this you can conclude
Select one:
a. achondroplasia is a result of incomplete dominance
b. achondroplasia is produced by a dominant allele
c. achondroplasia is produced by a recessive allele
d. achondroplasia is a result of codominance
Post Merge: A week ago

@bio_man need much help; I have to hand this in soon
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A week ago
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1. Which of the following states a valid conclusion based on the pedigree above? Select one: a. Individual I-2 does not carry the red-green colour blindness allele. b. All children of individuals I-1 and I-2 could be carriers of the red-green colour blindness allele. c. Individuals II-5 and II-6 are carriers of the red-green colour blindness allele. d. It is not possible to determine whether individuals III-2 and III-3 are carriers of the colour blindness allele. e. Individual II-2 passed on the red-green colour blindness allele to individual II-1.

#1 -- a. Individual I-2 does not carry the red-green colour blindness allele.
Post Merge: A week ago

2. Duchenne muscular dystrophy is an inheritable disorder that results in muscle weakness, leading to walking and breathing difficulties and heart disease. Duchenne Muscular Dystrophy   Which of the following is a valid conclusion about the Duchenne muscular dystrophy pedigree shown above? Select one: a. Without further evidence, the genotypes of individuals II-2 and III-2 cannot be determined. b. Individual II-3 can only pass on the affected allele to individuals III-2 and III-4. c. Only individuals I-2 and II-4 are confirmed carriers of the Duchenne muscular dystrophy allele. d. Only individuals I-1 and II-3 are confirmed carriers of the Duchenne muscular dystrophy allele.

#2 -- a. (more evidence needed).
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A week ago
Please limit topics to two questions per thread.

I've answered questions 1 and 2 above. If you need the rest answered, start a new thread.
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