BB Genetics

What are the genotypes of the parents in this diagram? (Using N for normal and n Tay-Sach's Disease)

• NN, Nn

• nn, nn

• NN, NN

• Nn, Nn

How is an allele described?

• form of a gene

• short segment of DNA

• part of a chromosome

• one haploid cell

What would the genotype of the offspring in box A be?

• RRRyy

• RrYy

• rrYy

• RRYY

What are the possible gamete types that can be produced from a parent who is YyRr? Meiosis produces eggs

and sperm that are alike.

• all Yr

• all YR

• Half YR and half yr

• YR, Yr, yR, and yr

A micrograph of matched pairs of human chromosomes can be used to confirm the overall condition of

homologous chromosomes in an individual. What is this diagnostic tool called?

• polygenic trait

• karyotype

• twin testing

• telomere

Many traits, such as stem length in plants and skin color and height in humans, are controlled by two or more

genes. What is this called?

• simple dominant inheritance

• monogenic inheritance

• polygenic inheritance

• codominance

The gene for brown eyes (B) is dominant over the gene for blue eyes (b). Two brown-eyed people have a blue eyed

child. Which genotypes make this possible?

• The mother is heterozygous brown-eyed (Bb) and the father is homozygous brown-eyed (BB).

• The mother is homozygous brown-eyed (BB) and the father is heterozygous brown-eyed (Bb).

• The mother and the father are both heterozygous brown-eyed (Bb).

• The mother and father are both homozygous brown-eyed (BB).

What is the effect of sickle-cell anemia?

• blocked respiratory pathways

• inefficient oxygen transportation

• susceptibility to contracting malaria

• decreased neurological functions

The tall allele, T, is dominant to the short allele, t, in Mendel’s pea plants. You examine a pea plant that exhibits the tall phenotype. What is its genotype?

• Tt

• TT

• tt

• TT and Tt

What percentage of the offspring would be able to roll their tongue?

• 100%

• 25%

• 75%

• 50%