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29 terms

Bioethics genetics review

STUDY
PLAY
T/F: twenty-three chromosome pairs in a human karyotype are similar in size and shape in a human male. (Change wording if wrong)
false, twenty-two
T/F: in a human karyotype, forty-four of the chromosomes are autosomes.
true
T/F: in humans, the mother determines the sex of the offspring
false, father
T/F: if a organism has 16 chromosomes in each of its egg cells, the organism's diploid number is 8.
false, 32 (for diploid number)
the number of chromosomes in a gamete is represented by the symbol ___
N
Which of the following represents a female?
XY
XXY
XXXY
XXX
XXX
Gametes are produced by the process of _____
meiosis
When during the cell cycle are chromosomes visible?
only during cell division
Unlike mitosis, meiosis results in the formation of ____ cells
haploid
Which of the following happens when a cell divides?
-the cell's volume increases
-it becomes more difficult for the cell to get enough oxygen and nutrients
-the cell has DNA overload
-each daughter cell receives its own copy of the parent cell's DNA
each daughter cell receives its own copy of the parent cell's DNA
how many chromosomes are shown in a normal human karyotype?
46
If an organism's diploid number is 12, its haploid number is ___
6
During normal mitotic cell division, a parent cell having 4 chromosomes will produce two daughter cells, each having ____ chromosomes
4
DNA is copied during a process called ____
replication
human females produce eggs that have ___
1 X chromosome
During DNA replication, a DNA strand that has the bases CTAGGT produces a strand with the bases ____
GATCCA
Gametes have _____
one allele for each gene
in eukaryotes, DNA is located ____
in the nucleus
because of base pairing in DNA, the percentage of _______ molecules in DNA is _____ to the percentage of thymine molecules
adenine, equal
in humans, a male has _____
1 X chromosome and 1 Y chromosome
DNA replication results in two DNA molecules, each with _______
one new strand and one original strand
The Watson and Crick model of DNA is a(n) ____, in which two strands are wound around each other.
double helix
The different forms of a gene are called ____
alleles
An organism's gametes have _____ the number of chromosomes found in the organism's body cells
half
How many sets of chromosomes are in a diploid cell?
2 sets (2n)
What would the effect be if the gametes of a species had the same number of chromosomes as the species' body cells?
during fertilization, a 2n cell and a 2n cell would combine, creating a 4n zygote
What happens to the number of chromosomes per cell during meiosis?
it is reduced to N, half its original number
homologous chromosomes
chromosome pairs with the same genes, but possibly different alleles
karyotype
picture of someone's chromosomes