Sophia - Human Biology - Unit 6 Milestone 6
1
What is the pinched region called where two sister chromatids are joined together?
• Centromere
•
... [Show More] Centriole
• Chromosome
• Centrosome
CONCEPT
Mitosis
2
A father is colorblind.
What are the odds that he passes this gene to his son?
• 100%
• 25%
• 0%
• 50%
CONCEPT
X-Linked Traits
3
Which of the following is true for homologous chromosomes?
• We receive two from each parent.
They contain the same set of genes, and are the same length and shape.
• We receive one from each parent.
They contain different sets of genes, and are different lengths and shapes.
• We receive one from each parent.
They contain the same set of genes, and are the same length and shape.
• We receive both from one parent.
They contain different sets of genes, and are different lengths and shapes.
CONCEPT
Structure of DNA and Chromosomes
4
Which of the following is a gene abnormality in which two nonhomologous parts rearrange and fuse together?
• Deletion
• Translocation
• Duplication
• None of these
CONCEPT
Chromosome Structure Changes
5
What is a genetic mutation?
• Change in DNA sequence
• Joining of DNA molecules
• Replication of DNA
• Transcription of DNA
CONCEPT
DNA Replication
6
Sometimes a trait can be influenced by multiple genes.
What would such a trait be called?
• Pleiotropy
• Multifactorial trait
• Polygenic trait
• Penetrance
CONCEPT
Polygenic Traits and Pleiotropy
7
Which of these is true about a clone?
• It is a hybrid version of two different cell types.
• It is a white blood cell infected by a virus.
• It is a genetic copy of a cell.
• It is a type of cancerous stem cell.
CONCEPT
DNA Technology and Research
8
Which of these is an autosomal recessive disorder that can result in mental retardation if levels of a certain amino acid get too high?
• Cystic fibrosis
• Down syndrome
• Huntington's disease
• Phenylketonuria
CONCEPT
Autosomal Recessive Traits and Disorders
9
Mark and Michelle both have dark hair, which is a dominant trait. But their first child is blonde.
Which is the most likely explanation?
• Another gene caused the alleles for brown hair to deactivate.
• It's not possible--Mark can't be the real father.
• One of the two has a blonde allele that is dominant in the child.
• Both parents have a recessive blonde allele that got passed on to their child.
CONCEPT
Punnett Squares
10
Which of the following statements is true regarding plasmids?
• All of the answer choices are correct.
• Plasmids are circular molecules of DNA.
• Plasmids may be transferred between different species of bacteria.
• Plasmids are sites for inserting genes for amplification.
CONCEPT
DNA Technology and Research
11
Bert has blonde hair (b). Molly has brown hair (B), but her genotype is Bb, meaning she carries a recessive blonde allele.
What is the likelihood of Bert and Molly's second child having brown hair?
• 50%
• 75%
• 25%
• 100%
CONCEPT
Punnett Squares
12
Which of these is responsible for the occurrence of disjunction?
• Duplication of genetic material
• Exchange of genetic material
• Fusion of homologous chromosomes
• Separation of homologous chromosomes
CONCEPT
Meiosis and Genetic Variability
13
Which of the following is the result of mitosis?
• Four diploid cells that are identical to the parent cell
• Two diploid daughter cells that are identical to the parent cell
• Two haploid cells that are identical to the parent cell
• Four haploid cells that are identical to the parent cell
CONCEPT
Mitosis
14
What is an observable characteristic? (e.g. a person's height or skin color)
• Locus
• Allele
• Genotype
• Phenotype
CONCEPT
Heredity
15
Which of the following statements is FALSE?
• RNA has uracil as one of its nitrogen bases while DNA does not.
• RNA has ribose sugar in its nucleotide while DNA has deoxyribose sugar.
• RNA is single-stranded while DNA is double-stranded.
• There are three types of DNA: mDNA, tDNA and rDNA.
CONCEPT
Protein Synthesis, Part 2: Translation [Show Less]