Biology Questions and Answers
generated by sexual reproduction to be
identical.of two normal in Nevertheless thdividuals oe karyotypf the samees
species and of the same sex are always
identical.is represente The human normal d by the formula 44+XX fokaryotype (^) r
women and 44+XY for men.
- What is the other name
given to sex chromosomes?
What is the function of sex
chromosomes?
Sex chromosomallosomes (the other chromosomes are also calledes that (^)
are not sex chrautosomes). omosomes are called
Sex chromosombecause they have genes thates get such name
determine the sex (male or female) of
an individual. Shave genes related ex chromosomto other biologicales also (^)
functions.
- How many chromosomes
does a human normal haploid
cell have? How many
chromosomes does a human
normal diploid cell have? How
many are the sex
chromosomes within each of
them?
The human haploid cell is the gamete
(egg cell agamete has 22 and sperm cell). The humanutosomes and 1
allosome, i.e., 23 chromosomes. The
diploid cell is the somatic44 autosomes and 2 allosomes, i. cell and it hase., 46
chromosomes.
Gametes have one sex chromosome and
somaticchromosomes. cells have two sex- Do phylogenetically
proximal species have cells
with proximal chromosome
counts?
The number of chromeach species is proximal fosomes typicalor of
phylogenetically proximal species (for
example, chimpanzee and human). But it is notorangutan, gorilla, (^)
impossible that evolutionary distant
species, like rat akaryotypes and the same total nnd oat, bears similarumber (^)
of chromosomes.
Even presentinchromosomes eg equal number ofvolutionary distant (^)
species havcharacteristicse radically since th differente quantity (^) and
the sequence of nucleotides that
compose thare quite different.eir respective DNA molecules
- What is the nucleolus?
The nucleolus is a small and optically
dense region in the interior nucleus. It is made of ribosomicof the cell RNA
(rRNA) and proteins. One nucleus can
have one or more nucleolus. - Of which structures is the
nuclear membrane composed?
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