BIO130H1 Lecture 24: BIO130 Lecture 24 Notes
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If an organismâs diploid chromosome number is 18, how many different possible combinations of homologous chromosomes lining up during meiosis exist for the eggs or sperm produced by that organism?
| A. | 512 | |
| B. | 9 | |
| C. | 18 | |
| D. | 128 | |
| E. | 36 |
At the end of metaphase I, _______________ separate.
| A. | sister chromatids | |
| B. | germ cells | |
| C. | homologous chromosomes | |
| D. | haploid chromatids | |
| E. | centrioles |
Mendel observed that dominant traits
| A. | are seen in all of the F1 hybrid pea plants in his experiments. | |
| B. | are expressed in all plants. | |
| C. | were absent in the F1 generation of pea plants that he used in his experiments. | |
| D. | were the only traits seen in the F2 generation of pea plants in his experiments. | |
| E. | are only expressed in hybrids. |
Cytokinesis in plant cells differs from cytokinesis in animal cells because
| A. | there is no difference. | |
| B. | in plant cells, the cell plate must also divide into two parts. | |
| C. | the contractile protein, actin, is important only in plant cells. | |
| D. | plant cells have a rigid cell wall. | |
| E. | a contractile ring forms only in plant cells. |
Sickle cell anemia is an example of what type of inheritance?
| A. | complete dominance | |
| B. | incomplete dominance | |
| C. | codominance | |
| D. | multiple alleles | |
| E. | recessive dominance |
Which of the following statements is true:
| A. | The dominant allele is masked in homozygous dominant individuals. | |
| B. | With recessive genetic disorders, if both parents are carriers, the offspring will all be affected. | |
| C. | In carriers, the recessive allele causes an intermediate phenotype. | |
| D. | In recessive genetic disorders, the mother and/or father of an affected individual must also be affected. | |
| E. | With dominant genetic disorders, the mother and/or father of an affected individual must also be affected. |
Skin cancers typically develop in the
| A. | upper layers of the epidermis. | |
| B. | lower layers of the dermis. | |
| C. | subcutaneous layer. | |
| D. | lower layers of the epidermis. | |
| E. | upper layers of the dermis. |
Duchenne muscular dystrophy (MD) is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father?
| A. | 1/2 | |
| B. | 0 | |
| C. | 1/16 | |
| D. | 1/4 | |
| E. | 1/8 |
The genetic makeup of a particular trait in an individual is its
| A. | genotype. | |
| B. | heterozygosity. | |
| C. | phenotype. | |
| D. | filial. | |
| E. | dominance. |
What structure holds the sister chromatids to the spindle fibers?
| A. | chromatin | |
| B. | kinetochore | |
| C. | MPF | |
| D. | centromere | |
| E. | cyclin |
If you view a cell in which the genetic material is beginning to be visible as separate bodies, and the nucleus has disappeared from view, you may surmise that the cells is in
| A. | telophase. | |
| B. | anaphase. | |
| C. | interphase. | |
| D. | metaphase. | |
| E. | prophase. |
Gregor Mendel was successful in his analysis of the genetics of pea plants because
| A. | he examined and analyzed both the F1 and F2 generations. | |
| B. | he studied the parental plants to determine their differences. | |
| C. | he decided to only look at his results in an objective manner. | |
| D. | he studied a trait that had a strange inheritance pattern. | |
| E. | pea plants have genetics different from other organisms. |
Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents that produced these plants?
| A. | None of the above | |
| B. | TtGg x Ttgg | |
| C. | ttGG x TTgg | |
| D. | TtGg x TtGg | |
| E. | TtGg x ttgg |
In humans, a gene that has been identified as causing a type of skin cancer is the
| A. | superwoman echidna. | |
| B. | mutant superman. | |
| C. | sonic hedgehog. | |
| D. | mutant mole rat. | |
| E. | superhero aardvark. |
The segregation principle states that in sexually reproducing diploid organisms the two copies of each gene
| A. | segregate from each other during meiosis. | |
| B. | must always be the same allele. | |
| C. | separate from each other during mitosis. | |
| D. | will both wind up in either the sperm or egg. | |
| E. | move together as a unit during meiosis. |
In what phases is the genetic material in the cell correctly referred to as chromatids?
| A. | metaphase and telophase | |
| B. | anaphase and metaphase | |
| C. | interphase and telophase | |
| D. | interphase and prophase | |
| E. | metaphase and prophase |
Consider two traits for an organism, determined by two genes, each of which is governed by at least two alleles. In the case of a dihybrid individual, the gametes formed will be of either the parental type or the recombinant type. Recombinant type gametes are formed because of
| A. | the principle of dihybrids. | |
| B. | multiple alleles. | |
| C. | heterozygosity. | |
| D. | incomplete dominance. | |
| E. | independent assortment. |
An allele is
| A. | an alternate form of a gene. | |
| B. | always recessive. | |
| C. | the main factor determining a trait. | |
| D. | always one of a pair. | |
| E. | the dominant form of a gene. |
After the DNA is replicated, and it condenses in prophase, two identical rods of DNA are seen. These are
| A. | spindle fibers. | |
| B. | kinetochores. | |
| C. | chromatids. | |
| D. | chromatin. | |
| E. | centromeres. |
Special cells found in the gonads that give rise to gametes upon division are called
| A. | egg cells. | |
| B. | somatic cells. | |
| C. | germ cells. | |
| D. | stem cells. | |
| E. | basal cells. |
Q:
If an organismâs diploid chromosome number is 18, how many different possible combinations of homologous chromosomes lining up during meiosis exist for the eggs or sperm produced by that organism?
| A. | 512 | |
| B. | 9 | |
| C. | 18 | |
| D. | 128 | |
| E. | 36 |
At the end of metaphase I, _______________ separate.
| A. | sister chromatids | |
| B. | germ cells | |
| C. | homologous chromosomes | |
| D. | haploid chromatids | |
| E. | centrioles |
Mendel observed that dominant traits
| A. | are seen in all of the F1 hybrid pea plants in his experiments. | |
| B. | are expressed in all plants. | |
| C. | were absent in the F1 generation of pea plants that he used in his experiments. | |
| D. | were the only traits seen in the F2 generation of pea plants in his experiments. | |
| E. | are only expressed in hybrids. |
Cytokinesis in plant cells differs from cytokinesis in animal cells because
| A. | there is no difference. | |
| B. | in plant cells, the cell plate must also divide into two parts. | |
| C. | the contractile protein, actin, is important only in plant cells. | |
| D. | plant cells have a rigid cell wall. | |
| E. | a contractile ring forms only in plant cells. |
Sickle cell anemia is an example of what type of inheritance?
| A. | complete dominance | |
| B. | incomplete dominance | |
| C. | codominance | |
| D. | multiple alleles | |
| E. | recessive dominance |
Which of the following statements is true:
| A. | The dominant allele is masked in homozygous dominant individuals. | |
| B. | With recessive genetic disorders, if both parents are carriers, the offspring will all be affected. | |
| C. | In carriers, the recessive allele causes an intermediate phenotype. | |
| D. | In recessive genetic disorders, the mother and/or father of an affected individual must also be affected. | |
| E. | With dominant genetic disorders, the mother and/or father of an affected individual must also be affected. |
Skin cancers typically develop in the
| A. | upper layers of the epidermis. | |
| B. | lower layers of the dermis. | |
| C. | subcutaneous layer. | |
| D. | lower layers of the epidermis. | |
| E. | upper layers of the dermis. |
Duchenne muscular dystrophy (MD) is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father?
| A. | 1/2 | |
| B. | 0 | |
| C. | 1/16 | |
| D. | 1/4 | |
| E. | 1/8 |
The genetic makeup of a particular trait in an individual is its
| A. | genotype. | |
| B. | heterozygosity. | |
| C. | phenotype. | |
| D. | filial. | |
| E. | dominance. |
What structure holds the sister chromatids to the spindle fibers?
| A. | chromatin | |
| B. | kinetochore | |
| C. | MPF | |
| D. | centromere | |
| E. | cyclin |
If you view a cell in which the genetic material is beginning to be visible as separate bodies, and the nucleus has disappeared from view, you may surmise that the cells is in
| A. | telophase. | |
| B. | anaphase. | |
| C. | interphase. | |
| D. | metaphase. | |
| E. | prophase. |
Gregor Mendel was successful in his analysis of the genetics of pea plants because
| A. | he examined and analyzed both the F1 and F2 generations. | |
| B. | he studied the parental plants to determine their differences. | |
| C. | he decided to only look at his results in an objective manner. | |
| D. | he studied a trait that had a strange inheritance pattern. | |
| E. | pea plants have genetics different from other organisms. |
Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents that produced these plants?
| A. | None of the above | |
| B. | TtGg x Ttgg | |
| C. | ttGG x TTgg | |
| D. | TtGg x TtGg | |
| E. | TtGg x ttgg |
In humans, a gene that has been identified as causing a type of skin cancer is the
| A. | superwoman echidna. | |
| B. | mutant superman. | |
| C. | sonic hedgehog. | |
| D. | mutant mole rat. | |
| E. | superhero aardvark. |
The segregation principle states that in sexually reproducing diploid organisms the two copies of each gene
| A. | segregate from each other during meiosis. | |
| B. | must always be the same allele. | |
| C. | separate from each other during mitosis. | |
| D. | will both wind up in either the sperm or egg. | |
| E. | move together as a unit during meiosis. |
In what phases is the genetic material in the cell correctly referred to as chromatids?
| A. | metaphase and telophase | |
| B. | anaphase and metaphase | |
| C. | interphase and telophase | |
| D. | interphase and prophase | |
| E. | metaphase and prophase |
Consider two traits for an organism, determined by two genes, each of which is governed by at least two alleles. In the case of a dihybrid individual, the gametes formed will be of either the parental type or the recombinant type. Recombinant type gametes are formed because of
| A. | the principle of dihybrids. | |
| B. | multiple alleles. | |
| C. | heterozygosity. | |
| D. | incomplete dominance. | |
| E. | independent assortment. |
An allele is
| A. | an alternate form of a gene. | |
| B. | always recessive. | |
| C. | the main factor determining a trait. | |
| D. | always one of a pair. | |
| E. | the dominant form of a gene. |
After the DNA is replicated, and it condenses in prophase, two identical rods of DNA are seen. These are
| A. | spindle fibers. | |
| B. | kinetochores. | |
| C. | chromatids. | |
| D. | chromatin. | |
| E. | centromeres. |
Special cells found in the gonads that give rise to gametes upon division are called
| A. | egg cells. | |
| B. | somatic cells. | |
| C. | germ cells. | |
| D. | stem cells. | |
| E. | basal cells. |