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A son can inherit X-linked (sex-linked) genes:

Two chromosomes that are the same but not genetically identical are referred to as _______________.

A recessive allele on the X chromosome is responsible for red-green color blindness in humans.  A woman with normal vision whose father is color-blind marries a color-blind man.  What is the probability that this couple’s son will be color-blind?  (I.e., if this couple had 2 sons, what is the probability that one of them would be color blind?)

If the alleles for a particular gene interact in the heterozygous condition to give an intermediate phenotype, this would be an example of:

Pick ONE of the problems below and complete it.   Question #1. Blood types in humans are caused by a combination of two of three possible alleles – IA, IB, and i. The i allele is recessive and individuals homozygous for this allele have blood types O. Blood type A may be due to either homozygous condition or the IA i genotype.  Blood type AB is caused by having a copy of both the IA and IB alleles.  Rh factor is another “marker” on human red blood cells and is either positive (dominant—R) or negative (recessive—r). A man with blood type B-negative, whose father was A-positive and whose mother was AB-positive, married a woman that was B-positive. The woman’s mother was AB-negative and her father was AB-positive.  Give the genotypes and phenotypes of the possible offspring from this marriage.   Question #2. Normal vision (XA) in humans is dominant to color blindness (Xa) and is X-linked. The determiner for brown eyes (B) is dominant to blue eyes (b) and is not X-linked. A colorblind man with brown eyes, whose mother was blue-eyed, marries a brown-eyed woman having normal vision, whose father was colorblind with blue eyes.  What is the expected phenotypic ratio of their male and female children involving eye color and color blindness.

CHD 210 in an on-line course which means that all assignments, discussions, and quizzes must be submitted through the use of Canvas.

DNA polymerase synthesizes on the 5’ –> 3’ direction.  What is located at the 3’ end of a DNA strand?

E. Situaciones habituales, probables, improbables o imposibles: El mundo de la escritura. El club de escritura en campus está hablando sobre algunas de las condiciones necesarias para escribir. Lee cada oración y escoge una de las estructuras verbales para completar el sentido de la oración. (1 pto. cada respuesta correcta; 8 ptos. en total) MODELO:  Si ella [ pudiera /  podía /  podrá] hablar con un escritor del pasado, elegiría a Miguel de Unamuno.   1. Si yo sólo [1] más creativo, escribiría poesía. 2. Yo habría terminado mi ensayo la semana pasada, si mi compañero de cuarto no me [2] con su música. 3. Si yo [3]  tiempo, me sentaría horas en la biblioteca escribiendo. 4. Estamos satisfechas con nosotras mismas, si solo [4] cinco páginas al día. 5. Si ellas se sentían deprimidas cuando eran jóvenes, [5] un poema del poeta Ernesto Cardenal para animarse. 6. Si yo hubiera dormido más durante el verano, [6] más de mi novela. 7. Si me envitan mañana a presentar sobre mi novela, [7] muy contento. 8. Podremos terminar el ensayo a tiempo, si [8] juntos.

Which one of the following diseases is considered as a human communicable disease? (Only one answer is correct)

NOTE ON SPELLING Spelling corrections apply to the following vocabulary activity. Each spelling error will result in minus ½ pt. per error. If you are unable to insert an accent mark, you will not lose points.