Genetics & Genetic Engineering Test Review

Genotype refers to the ...

• physical expression of the genes
• the possible combination of alleles in a gene
• whether an allele is dominant or recessive
• how an organism will appear

Which of the following is a phenotype?

• BB
• Bb
• bb
• Blue eyes

Which of the following is heterozygous

• FF
• tt
• Gg
• RR

Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?

• BB
• bb
• Bb
• bB

All individuals have two alleles for a given trait. According to Mendel's ____________, these alleles are passed down one each from both mother and father.

• Law of Segregation

• Law of Independent Assortment

• Law of Duel Alleles

• Law of Independent Assortment

A pedigree chart like this one is characteristic of _________________ disorders.

• dominant allelic

• autosomal recessive

• sex-linked dominant

• sex-linked recessive

How many possible genotypes and phenotypes are there for a single gene trait that shows dominance in any given population?

• One genotype, one phenotype

• Two genotypes, two phenotypes

• Two genotypes, three phenotypes

• Three genotypes, two phenotypes

The characteristic indicated by the blackened figures is probably...

• dominant.

• recessive.

• non-dominant.

• sex-linked recessive.

What is the genotype of individual II-2?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

In guinea pigs, black fur is dominant. If a black guinea pig is crossed with a white guinea pig and the litter contains a white offspring, the genotype of the black-haired parent is probably?

• BB

• Bb

• B

• bb