1) Actual genetic makeup A) Homozygous
2) A chromosome pair that may be very different in size B) Sex chromosomes
3) Genes not expressed unless they are present in homozgous condition. C) Genotype
4) Situation in which an individual has identical alleles
Answer
1) Actual genetic makeup C) Genotype
2) A chromosome pair that may be very different in size B) Sex chromosomes
3) Genes not expressed unless they are present in homozgous condition. D) Recessive
4) Situation in which an individual has identical al
5) Genes for the same trait that have different expressions. A) Hetrozygous
6) The gene allele that suppresses or masks the expression of the other allele B) Autosomes
7) Situation in which an individual has different alleles making up the genotype for a
Answer
5) Genes for the same trait that have different expressions. C) Allele
6) The gene allele that suppresses or masks the expression of the other allele. D) Dominant
7) Situation in which an individual has different alleles making up the genotype for
9) The dominant gene is expressed when present; the recessive is expressed only in the absence of the dominante gene. A) Sex-linked inheritance
10) The hetrozygote has a phenotype intermediate between those of the homozygous dominant and homozygous recess
Answer
9) The dominant gene is expressed when present; the recessive is expressed only in the absence of the dominante gene. D) Incomplete dominance
10) The hetrozygote has a phenotype intermediate between those of the homozygous dominant and homozygous r
14) Is the genetic diversity due entirely to inherited genes on the sex chromosomes?
A) Yes, because the female has two X chromosomes and the male has only one X chromosome.
B) Yes, because the male has a Y chromosome
C) Yes, because genetic diversity is
Answer
D) No, because genetic diversity is due to crossing-over of autosomal chromosomes.
15) The reason recessive genetic disorders are more frequent than disorders inherited as dominant is that _____.
A) Dominante genetic disorders are never expressed in males.
B) People carrying dominant genetic disorders always die before birth
C) Carriers
Answer
C) Carriers may pass them on to their offspring, unaware that they are carriers.
16) An example of multiple-allele inheritance is______
A) The ABO blood group
B) The appearance of freckles on the skin
C) The appearance of birthmarks on the skin
D) Hair that seems to have several shades of color
Answer
A) The ABO blood group
17) Which of the following is true concerning environmental influence on genetic expression?
A) It is impossible to alter in any way the expression of gene in humans
B) The only time a gene can be influenced by environmental factors is in the second trime
Answer
D) Drugs and nutrition can alter normal gene expression.
18) Sex chromosomes of a normal male are _____
A) XX
B) YY
C) XY
D) Any of these, depending on the father.
Answer
C) XY
19) A women has blond hair and brown eyes. This statement is best described as indicating_____
A) Allelic pairs
B) Recessive traits
C) Phenotype
D) Genotype
Answer
C) Phenotype
20) Inheritance of height in humans is due to_____
A) Polyploidy
B) Polymorphism
C) Incomplete dominance
D) Polygene inheritance
Answer
D) Polygene inheritance
21) Given the information in figure 29.1, what would be the genotype of the offspring designated by the blank square?
A) GG
B) Gg
C) gg
D) Dg
Answer
C) gg
22) Given the information in Figure 29.1, what would the genotype ratio be for the offspring?
A) 1:1:1:1
B) 1:2:1
C) 1:3
D) 4:0
Answer
B) 1:2:1
23) Given the information in Figure 29.1, what is the phenotype ratio (assuming C is dominant and there is no incomplete dominance)?
A) 1:1:1:1
B) 1:2:1
C) 1:3
D) 4:0
Answer
A) 1:1:1:1
24) A couple whose blood type are A and B may have a child with which of the following blood types?
A) AB only
B) A or B only
C) A, B, AB, or O
D) AB or O only
Answer
B) A or B only
25) Gene mutations in the sex chromosomes of the human would tend to become visibly expressed_____
`
B) More frequently in females
C) Equally frequently in both sexes
D) None of the above
Answer
A) More frequently in males