The addition of the 3’-CCA is catalyzed by the enzyme tRNA nucleotidyltransferase, which functions as a nontemplate-directed RNA polymerase.

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#Id: 2051

#Unit 8. Inheritance Biology

Y-Linked Trait

a. Only males are affected.

b. Passed from father to all sons.

c. Does not skip generations.

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#Id: 2052

#Unit 8. Inheritance Biology

Cytoplasmic Inheritance

a. Present in males and females.

b. Usually inherited from one parent, typically the maternal parent.

c. Reciprocal crosses give different results.

d. Exhibit extensive phenotypic variation, even within a single family.

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#Id: 2053

#Unit 8. Inheritance Biology

Homoplasmy- All mutated mitochondria

Heteroplasmy- wild type + mutant mitochondria

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#Id: 2054

#Unit 8. Inheritance Biology

Leber hereditary optic neuropathy (LHON)- People who have this disorder experience rapid loss of vision in both eyes, which results from the death of cells in the optic nerve.

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#Id: 2073

#Unit 8. Inheritance Biology

Number of Barr bodies zero in human cells with different complements of sex chromosomes such as XO (loss of one sex chromosome) causes Turner Syndrome.

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#Id: 2074

#Unit 8. Inheritance Biology

Persons with Klinefelter syndrome have a Y chromosome and two or more X chromosomes in their cells such as XXY, XXYY, XXXY and XXXXY.