Bio homework 3

If the heterozygous phenotype is somewhere between the homozygous dominant phenotype and the homozygous recessive phenotype then the alleles are said to be ________________. 

Group of answer choices

incomplete penetrance

recessive

incomplete dominance

codominant

 

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Question 20.5 pts

The A and B alleles in the ABO blood group system are an example of

Group of answer choices

incomplete penetrance

incomplete dominance

codominance

recessive

 

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Question 30.5 pts

____________________ is the probability that an individual having a dominant allele will show the associated phenotype.

 

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Question 40.5 pts

Studies show that 70% of women carrying one of the alleles associated with breast cancer (BRCA1) will develop breast cancer before the age of 70.  This allele typically has a dominant mode of inheritance.  What is this an example of?

Group of answer choices

incomplete penetrance

recessive

incomplete dominance

codominance

 

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Question 50.5 pts

Cystic fibrosis is caused by a mutation in a single gene. However, this gene controls multiple phenotypes.  This is an example of

Group of answer choices

pleiotropy

incomplete penetrance

codominance

incomplete dominance

 

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Question 60.5 pts

Identical twins should have identical alleles; however, sometimes they have different phenotypes.  Once explanation of this is due to

Group of answer choices

pleiotropy

epigenetics

codominance

incomplete dominance

 

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Question 70.5 pts

The strengthening of a trait from one generation to the next is called _________________________.

 

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Question 80.5 pts

Which of the following is an example of an environmental effect on a phenotype?

Group of answer choices

Bacteria growing at room temperature are red.  Those same bacteria growing at human body temperature are white.

A mutation in the gene for sickle cell anemia leads to changes in numerous phenotypes.

Symptoms of schizophrenia are worse in children than in parents.

A person carries the gene for Huntington's disease but never develops the phenotype.