front 1 T/F You genotype is a description of your combination of alleles for a given phenotype. | back 1 True |
front 2 How many chromosomes are in a haploid human cell? | back 2 23 |
front 3 How many alleles exist for a given gene? | back 3 Each gene can have a different number of alleles. |
front 4 If a person is homozygous for a particular trait this means ______. | back 4 the person has two identical alleles for the gene responsible for the trait. |
front 5 A dominant allele is best defined as ______. | back 5 an allele that stops or hides the expression of the other allele. |
front 6 A woman has blond hair and brown eyes. This statement is best described as indicating _______. | back 6 phenotype. |
front 7 Recessive alleles are best defined as _______. | back 7 only expresses in present in a double dose. |
front 8 What phenotype is associated with the genotype 47, XXY? | back 8 Klinefelter's syndrome |
front 9 Why are both paternal and maternal chromosomes present in some gametes? | back 9 To increase variability of the offspring. |
front 10 During what phase of meiosis do the tetrads align together in preparation for being separated? | back 10 Metaphase I |
front 11 Chimpanzees have a diploid number of 48. How many total chromosomes should each of their diploid body cells have? | back 11 48 |
front 12 Which of the following is specifically associated with the formation and dissociation of chiasmata? | back 12 Genetic variability |
front 13 During metaphase of meiosis I, homologous chromosomes and the alleles they possess are distributed to different gametes. What is this called? | back 13 Segregation. |
front 14 Hair color and eye color are genes are located on the same chromosome. Since these genes are transmitted as a unit to daughter cells during mitosis, we describe these genes as... | back 14 linked. |
front 15 Genes on the same chromosome are said to be _______. | back 15 linked. |
front 16 What is the probability of a couple having three girls in a row? | back 16 1/8 |
front 17 A female infant is born with around one million oocytes, each one genetically unique. This is due to ______. | back 17 independent assortment & random cross over. |
front 18 Using Tt and Tt, what is the probability of producing a homozygous dominant offspring? | back 18 25% |
front 19 The ability to roll the tongue into a U shape may be assigned to a single dominant allele, T. Using Tt and Tt, what is the probability of producing an offspring who can roll his/her tongue? | back 19 75% |
front 20 Using Tt and Tt, what is the genotype of a homozygous recessive offspring? | back 20 tt |
front 21 At least three genes control skin color. How many possible combinations of skin color could result from those three genes with the mating of parents containing AABBCC (very dark) and aabbcc (very light)? | back 21 64 |
front 22 At how many weeks of pregnancy can chorionic villus sampling (CVS) be safely performed? | back 22 10 weeks |
front 23 During amniocentesis, a need withdraws fluid from ______. | back 23 amniotic sac. |
front 24 If two parents are heterozygous (Tt) for a trait, which is NOT a possibility for their offspring? a) Half of the potential offspring would be genotypically different than the parents b) Half of their offspring would be heterozygous c) All of their offspring would be dominant for the trait d) Most of the offspring would have the dominant phenotype | back 24 c) All of their offspring would be dominant for the trait. |
front 25 Which of the following is an example of a disorder that exhibits incomplete dominance? a) Tay-sachs disease b) Cystic fibrosis c) Sickle-cell anemia d) Syndactyly | back 25 c) Sickle-cell anemia |
front 26 The gene responsible for the condition known as sickle-cell anemia demonstrates ______. | back 26 incomplete dominance. |
front 27 Given Cc and Cc, what is the phenotype ratio (assuming C is dominant and there is no incomplete dominance)? | back 27 3:1 |
front 28 Given Cc and Cc, if C were an incomplete dominant trait, what would the phenotype ratio be for the offspring? | back 28 1:2:1 |
front 29 Huntington's disease involves ______. | back 29 degeneration of the basal nuclei of the brain. |
front 30 Which type of inheritance involves genes found on the non-autosomal chromosomes? | back 30 sex-linked inheritance |
front 31 Inheritance of stature (height) in humans is probably due to ________. | back 31 sex-linked inheritance. |
front 32 Best summarizes the difference between genotype and phenotype... | back 32 genotype refers to the gene alleles that one has, and phenotype refers to the trait that is expressed in response to those alleles. |
front 33 Are enviromental factors more likely to affect genotype or phenotype? | back 33 Phenotype |
front 34 A chromosomal aberration in which part of a chromosome is lost is known as _____. | back 34 deletion. |
front 35 Sam has type A blood. Which of the following blood types are NOT at all possible for Sam's offspring? a) type O b) type B c) type A d) all of the listed blood types are possible. | back 35 d) all of the listed blood types are possible. |
front 36 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? | back 36 Mitochondria |
front 37 Pedigrees and blood test are both means of _______. | back 37 carrier recognition. |
front 38 For which of the following are newborns infants not routinely screened at birth? | back 38 Color blindness |
front 39 Which of the following is a noninvasive method for predicting genetic disease? a) blood test b) pedigree c) amniocentesis d) choronic-villus sampling | back 39 b) pedigree |