Biology Ch 11 pg 1&2

Refer to figure 11-1. If individual III-2 marries a person with the same genotype as individual I-1, what is the chance that one of their children will be afflicted with hemophilia? A. 0%. B. 25%. C. 50% d. 75%

A. 0%

A phenotype that results from a dominant allele must have at least ??? dominant allele(s) present in the parent(s). A. One B. Two C. Three D. Four

A. One

If a fruit fly heterozygous for red eyes (XRXr) crossed with a white-eyed male (XrY), what percent of their offspring would have white eyes? A. 0% B. 25% C. 50% D. 75%

C. 50%

When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon examination, it can be seen that the coat of a roan cow consisted of both red and white hairs. This trait is one controlled by ??? A. Multiple alleles B. Codominant alleles C. Sex linked genes D. Polygenic inheritance

B. Codominant alleles

What is the relationship between individuals I-1 and individual III-2 in figure 11-1? A. Grandfather-granddaughter B. Grandmother- grandson C. Great aunt-nephew D. Mother-son

B. Grandmother-grandson

Based on figure 11-2, what do you know about individual III-2's mother? A. She had the trait B. She was a carrier C. She was homozygous recessive D. She was homozygous dominant

B. She was a carrier

What is the probable mode of inheritance for the normal trait ink figure 11-2 A. Simple dominant B. Polygenic C. Sex linkage D. Multiple alleles

C. Sex linkage

According to the pedigree in figure 11-2, how many of the offspring in the III generation show the normal trait? A. 1 B. 2 C. 4 D. 5

C. 4

A cross between a white rooster and a black hen results in 100% blue Andalusian offspring. When two of these blue offspring are mated, the probable phenotypic ratio sen in their offspring would be ? A. 100%blue B. 75% black, 25% white C. 75% blue, 25% white D. 25% black, 50% blue, 25% white

D. 25% black, 50% blue, 25% white

For the trait being followed in the pedigree, individuals II-1 and II-4 in figure 11-1 can be classified as ??? A. Homozygous dominant B. Mutants C. Homozygous recessive D. Carriers

D. Carriers

What type of inheritance pattern does the trait represented by the shaded symbols in figure 11-1 illustrate? A. Incomplete dominance b. Multiple alleles c. Codominance d. Sex-linked

D. Sex linked