Mastering A&P Chapter 29 Heredity

Use the following information to solve the problem using a Punnett square. Assume that the dominant "B" allele encodes brown eyes and the recessive "b" allele encodes blue eyes. An individual with the genotype BB has children by mating with an individual of the genotype bb. What is the percent chance that they would have children with blue eyes? A. 0% B. 25% C. 50% D. 100%

A. 0% All of the offspring would have brown eyes.

How many chromosomes are in a haploid human cell? A. 23 B. 46 C. 48 D. 92

A. 23 This is the haploid human chromosomes

Which of the following is NOT a source of genetic variation? A. age of either or both parents B. independent assortment of chromosomes C. crossover of homologous chromosomes D. random fertilization of eggs by sperm

A. age of either or both parents Age does not play a role in variation of gametes.

Genes on the same chromosome are said to be __________. A. linked B. independent C. homologous D. recessive

A. linked Genes on the same chromosomes are said to be linked.

Nuclear DNA is NOT the only source of genetic information in the cell. Which of the following is another source of DNA in the cell? A. mitochondria B. nucleoli C. Golgi bodies D. rough ER

A. mitochondria Mitochondria have their own DNA separate from the nuclear DNA of the cell.

The genetic determination of blood type is based on __________ inheritance. A. multiple-allele B. sex-linked C. polygene D. dominant-recessive

A. multiple-allele There are three alleles for blood type.

An allele that can mask another allele is said to be __________. A. homozygous B. heterozygous C. dominant D. recessive

C. dominant A dominant allele cannot be masked. Its trait will appear regardless of its partner allele on the other matching chromosome.

Which of the following is a noninvasive method for predicting genetic disease? A. amniocentesis B. choronic-villus sampling C. pedigree D. blood test

C. pedigree Pedigree analysis involves looking at phenotypic data from person's family tree to analyze whether or not an individual might be prone to a genetic anomaly.

Skin color, controlled by three separately inherited genes that each exist in two allelic forms (A, a; B, b; C, c), is an example of which form of inheritance? A. sex-linked inheritance B. dominant-recessive inheritance C. polygene inheritance D. multiple-allele inheritance

C. polygene inheritance Polygene inheritance is the term that describes when multiple genes control one overall phenotype.

Which of the following does NOT match the term to its correct definition/description? A. genotype: genetic makeup B. heterozygous: both a dominant and a recessive allele are present C. recessive: gene expressed when present D. phenotype: physical appearance

C. recessive: gene expressed when present Recessive traits are only expressed if a person has two recessive alleles.

If two parents are heterozygous (Tt) for a trait, which of the following is NOT a possibility for their offspring? A. Half of the potential offspring would be genotypically different than the parents. B. Most of the offspring would have the dominant phenotype. C. Half of their offspring would be heterozygous. D. All of their offspring would be dominant for the trait.

D. All of their offspring would be dominant for the trait. One quarter of their potential offspring would be recessive for the trait.

Same has type A blood. Which of the following blood types are NOT at all possible for Sam's offspring? A. type A B. type B C. type O D. all of the listed blood types are possible

D. all of the listed blood types are possible Depending on whether Sam is heterozygous with a recessive allele to donate or if he donates the A allele, all of the choices listed are possible for Sam's offspring.