Mendel /punnett

Which of the following pairs is not correct?

• kk = hybrid

• hybrid = heterozygous

• Heterozygous = Hh

• Homozygous = BB

Homozygous means that...

• The trait is represented with two different alleles

• The trait is represented with two similar alleles

• The trait is represented with two identical alleles

• The trait is represented with two genes

In dogs, there is a hereditary deafness caused by a recessive gene, “d.” A kennel owner has a male dog (Gilbert) that she wants to use for breeding if possible. The dog can hear.What are the two possible genotypes of Gilbert?

• The two possible are DD and dd

• The two possible are Dd and dd

• The two possible are DD and Dd

• It only can be dd

In mussels, brown coloring (B) is dominant, and blue coloring (b) is recessive. A homozygous brown mussel crosses with a blue mussel. What percentage of offspring are expected to be blue?

• 0%

• 100%

• 25%

• 50%

• 75%

In guinea pigs, short hair is dominant over long hair. If a short haired SS guinea pig is crossed with a long haired ss guinea pig, what are the possible genotypes and phenotypes of their offspring?

• Genotype: SS and ss Phenotype: Long hair and Short hair

• Genotype: Ss and ss Phenotype: Long hair and Short hair

• Genotype: SS Phenotype: Short hair only

• Genotype: Ss Phenotype: Short hair only

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms heterozygous for a single trait is expected when

• Segregation happens

• When two homozygous dominant individuals are crossed

• When two homozygous recessive individuals are crossed

• When two heterozygous individuals are crossed

In humans brown eyes are dominant over blue eyes. What type of pffspring would you expect if you crossed a heterozygous brown eyed person to a heterozygous brown eyed person?

• Blue: 50% Brown: 50%

• Brown: 100%

• Blue: 75% Brown: 25%

• Blue: 25% Brown: 75%

In humans brown eyes are dominant over blue eyes. What type of pffspring would you expect if you crossed a homozygous brown eyed person to a heterozygous brown eyed person?

• BB : 100%

• Bb: 100%

• Bb: 25% BB: 75%

• Bb: 75% BB: 25%