PSS 3421 test 1 questions & answers 2024/2025
(T/F) Cells with a single set of chromosomes are called diploid - ANSWERSfalse
The mode of cell division which results in four daughter cells that are genetically different, with each cell containing one haploid set of chromosomes, is known as? ...
(T/F) Cells with a single set of chromosomes are called diploid - ANSWERSfalse
The mode of cell division which results in four daughter cells that are genetically different, with each cell
containing one haploid set of chromosomes, is known as? - ANSWERSmeiosis
_________________ chromosomes pair in meiosis and have the same genetic loci and structure -
ANSWERShomologous
Chromosomes become aligned along the cell's equator during this phase of mitosis. -
ANSWERSmetaphase
______ refers to the splitting of the cytoplasm, separating one cell into two. - ANSWERScytokinesis
The physical exchange of segments between homologous chromosomes is called - ANSWERScrossing
over
This stage of the mitotic phase, is marked by the arrival of the chromosomes at the spindle poles. -
ANSWERStelophase
Stage of meiosis in which bivalents become aligned on the metaphase plate - ANSWERSmetaphase I
During the cell cycle, DNA is synthesized during - ANSWERSS phase
During the later stage of this mitotic phase, the chromosomes are arranged in a single plane, the
metaphase plate, between the two centrosomes. - ANSWERSmetaphase
, The longitudinal halves of a chromosome that has undergone replication are known as -
ANSWERSchromatids
Which of these phases is the longest phase of mitosis? - ANSWERSprophase
During prophase I of meiosis, crossing over is indicated by what microscopically visible structure? -
ANSWERSsynaptonemal complex or chiasmata
During this stage of the mitotic phase, the chromosomes have just become visible under a light
microsope. - ANSWERSprophase
A genetic cross in which the hybrid organisms are crossed with one of the parental genotypes is called a
____________. - ANSWERSbackcross
Which of the following was not one of Mendel's conclusions based on his monohybrid crosses? -
ANSWERSgenes are carried on chromosomes
In a cross between pure-breeding tall plants with pure-breeding short plants, all of the F1 are tall. When
these plants are allowed to fertilize themselves, the F2 plants occur in a ratio of 3 tall:1 short. Which of
the following is not a valid conclusion from these results? - ANSWERSthe tall and short traits assort
independently of each other in this cross
what is the phenotypic expression of the heterozygote identical to one of the homozygous genotype? -
ANSWERScomplete dominance
Assuming independent assortment, how many different gametes can be formed by an organism that is
heterozygous for n genes? - ANSWERS2n
What is the probability of obtaining offspring with the recessive phenotype from a mating between a
heterozygous parent and tester? - ANSWERS1/2
In the cross Aa Bb Cc Dd × Aa Bb Cc Dd, in which all genes undergo independent assortment, what
proportion of offspring are expected to be AA bb Cc DD? - ANSWERS1/128
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