Biology 120 Midterm
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- What happens at the conclusion of Meiosis I?
- Homologous chromosomes are separated.
- A cross between a garden pea with yellow pods and a garden pea with green pods produces an F1 generation in which all the peas have green pods. This is an example of:
- Complete dominance
- Which blood type is the least common in the population of the US?
- AB
- Sister chromatid begins to separate during what stage of mitosis?
- Anaphase
- What amount of time is required to complete meiosis in human females?
- Years
- During the G1 phase of the cell cycle, a decision is made on whether the cell will continue through the cycle or:
- enter into a non-dividing state (G0)
- What is the genotype for all possible gametes of an organism with a genotype of RRSstt?
- RSt, Rst
- Alleles are:
- different versions of the same gene
- The giant American land beaver has 16 pairs of chromosomes in the nucleus of its cells. How many chromosomes are present in a single sperm or egg cell?
- 16
- The centromere is a region in which:
- chromatids are attached to one another
- Recombination or crossing over occurs during which phase of meiosis
- prophase I
- Which occurs in meiosis but not in mitosis?
- pairing of homologous chromosomes
- In humans, aneuploidy is tolerated (results in a live birth) when it occurs in:
- sex chromosomes and certain autosomes
- When Mendel conducted his experiments to study heredity, he started with what kind of parental strains?
- Homozygous
- In meiosis, the end products:
- are called gametes
- Before a cell can enter the mitosis, it must first:
- duplicate its chromosomes
- Which phenotypic ratio observed in the F2 generation could suggest a trait exhibits codominance in its method of inheritance?
- 2:1:1
- The giant purple ameoba, a single-celled organism, contains 5 pairs of chromosomes in its nucleus. It undergoes mitosis. How many chromosomes does each of the daughter cells contain?
- 10
- Cancer cells:
- ignore cell cycle checkpoints, resulting in uncontrolled cell division
- Growth and repair occur at the cellular level through a process called:
- Mitosis
- Bacterial cells divide and reproduce by a process called:
- binary fission
- Certain requirements need to be met at a ___________ to enable the cell to continue on to the next stage of the cell cycle.
- checkpoint
- The only example of monosomy (one copy of a chromosome) which occurs in humans is:
- XO, Turner's syndrome
- Humans have ____ pairs of chromosomes in their cells.
- 23
- Equational division of chromosomes
- Both meiosis and mitosis
- Separation of homologous chromosomes
- Meiosis
- Separation of sister chromatids
- Both meiosis and mitosis
- Breakdown of the nuclear membrane
- Both meiosis and mitosis
- Condensation of chromosomes
- Both meiosis and mitosis
- Reductional division of chromosomes
- Meiosis
- Anaphase
- Meiosis
- Down's Syndrome
- Meiosis
- Cytokinesis
- Both meiosis and mitosis
- Prophase
- Mitosis
- Cancer
- Mitosis
- Spindle formation
- Both meiosis and mitosis
- What is one difference between meiosis in human females and meiosis in human males?
- Speed, women are a lot slower and are born with everything they'll need though they develop over years. Men however are constantly producing sperm because they develop very quickly.