Term
| Within a set of human chromosomes, 22 pairs are called _______. |
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Definition
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Term
Which of the following is true regarding egg cells?
A) They always contain an X chromosome.
B) They contain an X or Y chromosome.
C) They contain 23 pairs of chromosomes.
D) None of these is correct. |
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Definition
| A) They always contain an X chromosome |
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Term
A color-blind male child always receives the gene for color blindness from his mother.
True or False |
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Definition
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Term
| When is the chromosome number reduced by one-half during gametogenisis? |
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Definition
| during the first meiotic division |
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Term
| Hemophilia is _______________. |
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Definition
| characterized by a defect in the clotting mechanism |
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Term
| ________ inheritance is due to recessive genes located on X chromosomes. |
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Definition
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Term
| If an egg cell without an X chromosme is fertilized by an X-bearing sperm cell, then this will result in _________. |
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Definition
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Term
Nondisjunction in which homologous autosomes do not separate, therefore a cell receives an extra chromosome, results in:
A) Patau's syndrome
B) Edward's syndrome
C) Down's syndrome
D) All of these are correct |
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Definition
| D) all of these are correct |
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Term
The chromosomes of a set that contain similar genetic material compromise a(n) ______.
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Definition
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Term
| X-linked genes are always expressed more frequently in males than in females due to the fact that _________. |
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Definition
| there is no allele on Y chromosomes |
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Term
| A procedure used to obtain enough fetal tissue to test for genetic disorders by culturing cells is called _________. |
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Definition
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Term
| When the alleles of a gene pair are identical they are said to be __________. |
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Definition
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Term
| In a simple dominant-recessive inheritance pattern, what percentage of the offspring would be expected to exhibit the dominant trait if the parents were heterozygous and homozygous-recessive? |
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Definition
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Term
| If the parent genotypes are AA and aa, the offspring are expected to be ____. |
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Definition
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Term
| The portion of a DNA molecule that contains the information for producting one kind of protein is called a(n) ________. |
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Definition
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Term
If one parent has sickle cell anemia and the other parent is normal, the chance of a child with sickle cell anemia is 50%.
True or False |
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Definition
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Term
| The significance of synapsis during meiosis is that ______________. |
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Definition
| intertwined chromosomes may break and exhange parts |
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Term
| If a Y-bearing sperm cell fertilizes a normal egg cell, the zygote will be a ______. |
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Definition
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Term
| Genetics is the study of _________. |
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Definition
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Term
The phenotypes expected from the cross of a color-blind male and a normal (homozygous dominant) female are:
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Definition
| all males and females have normal color vision |
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Term
| If the blood type gene IO is present in the genotype, the person cannot have blood of type ____. |
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Definition
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Term
| An example of a sex-influenced trait is ______. |
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Definition
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Term
| A gene that is not expressed in the heterozygous condition is called _________. |
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Definition
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Term
| Dominant genes in a genotype are designated by _______. |
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Definition
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Term
| Homologous pairs of chromosomes are ____________. |
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Definition
| chromosomes from the mother and father that contain similar genetic information |
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Term
| A gene is defined as a _____________. |
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Definition
| portion of a DNA molecule that contains the information for producing one kind of protein molecule |
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Term
| In meiosis, crossing over occurs during the ___________. |
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Definition
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Term
| The phenotypes that would result from the cross of H1H2 and H1H2 (H1 represents the normal gene for hemoglobin and H2 represents the incomplete dominant allele that causes the formation of abnormal hemoglobin are: |
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Definition
| 25% normal, 50% sickle cell trait, 25% sickle cell anemia. |
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Term
| A person with type A blood could have the genotype _________. |
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Definition
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Term
| An example of a homozygous gene pair is _____. |
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Definition
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Term
Which of the following would not be a possible blood type for the baby of a mother with type AB and a father with type B blood?
A) AB
B) A
C) B
D) O |
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Definition
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Term
| The origin of the 46 chromosomes in a human zygote is _____________. |
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Definition
| half from the sperm and half from the egg |
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Term
The particular combination of genes present within a zygote constitutes its genotype.
True or False |
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Definition
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Term
| Incomplete dominance is defined as _____________. |
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Definition
| gene pairs occurring in two forms that are expressed differently and neither is dominant to the other |
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Term
| If the parent genotypes are Aa and Aa, the offspring are expected to be: |
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Definition
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Term
| An individual who is homozygous dominant for a trait can be symbolized ____. |
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Definition
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Term
The total number of chromosomes found within a human zygote is 23.
True or False |
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Definition
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Term
| During which stage in mitosis are genes and chromosomes duplicated? |
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Definition
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Term
A normal male has the sex chromosome combination XX.
True or False |
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Definition
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Term
If a color-blind male is married to a homozygous dominant (normal) female, the possible offspring are:
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Definition
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Term
| Genetic transmission of genes located within a portion of the Y chromosome for which there is no homologous region in the X chromosome is called ________. |
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Definition
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Term
| The genotypes and phenotypes that would result from the cross of Aa and Aa (A = normal pigmentation and a = albinism) are: |
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Definition
| phenotypes-3/4 normal and 1/4 albino; genotypes-1/4 homozygous dominant, 1/2 heterozygous, and 1/4 homozygous recessive. |
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Term
| The phenotypes and genotypes that would result from a cross of Aa and aa (A = normal pigmentation and a = albinism) are: |
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Definition
| phenotypes-half normal and half albine; genotypes-half heterozygous and half homozygous recessive |
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Term
| The genotypes and pheotypes that would result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are: |
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Definition
| phenotypes-all normal; genotypes-50% homozygous dominant and 50% heterozygous. |
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Term
| Down's syndrome is caused by _______. |
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Definition
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Term
Which of the following is true in regard to the determination of the gender of a baby?
A) The sex chromosome in the egg determines the gender of the baby
B) The sex chromosome in the sperm determines the gender of the baby
C) The cells of all babies contain the same sex chromosomes.
D) None of these is correct |
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Definition
| B) The sex chromosome in the sperm determines the gender of the baby |
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Term
| The phenotypes expected from the cross of a color-blind female and a normal male are: |
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Definition
| all females have normal color vision and all males are color blind. |
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Term
| When the alleles of a gene pair are different they are said to be _________. |
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Definition
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Term
The phenotypes that would result from the cross of H1H1 and H1H2 (H1 represents the normal gene for hemoglobin and H2 represents the incomplete dominant allele that causes the formation of abnormal hemoglobin) are:
A) all offspring would be normal
B) 3/4 normal offspring and 1/4 with sickle cell trait
C) all offspring with sickle cell trait
D) none of these is correct |
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Definition
| D) none of these is correct |
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Term
| When the alleles of a gene pair are expressed differently but neither is dominant to the other, they are called ________. |
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Definition
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