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Animal Science Genetics and Breeding - 4 & 5 Questions With Complete Solutions
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Animal Science Genetics and Breeding - 4 & 5 Questions With Complete Solutions
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Animal Science Genetics and Breeding - 4 & 5Questions With Complete Solutions
zygote
fertilized egg - starting point of most life cycles
zygote divides many times to produce
an adult organism
mitosis
simple division of one cell into two, the two daughter cells receive an exact copy of genetic material of parent cell
meiosis
genetic material halved so that diploid complement is reformed by fertilization (in animals, this is gamete formation)
nucleus contains " " chromosomes
rod-like
chromosomes are in pairs and each has
genes
constrictions where point of attachment lie
centromere
when cells divide chromosomes do as well
each species has a characteristic number of
pairs of chromosomes
which type of animal has the greatest number of chromosomes
poultry
which type of animal has the fewest number of chromosomes
swine
how many chromosomes do humans have
23 chromosomes, 46 total
mitosis is a __ process
continuous
four stages of mitosis
prophase, metaphase, anaphase, telophase (PMAT)
mother and daughter cells have exactly the same
genetic components
diploid
2n
haploid
n gametogenesis
formation of sex cells
production of sex cells occurs in the
testicle or ovary
spermatogenesis - gametes from the testicle are
sperm
oogenesis- gametes from the testicle are
eggs
each newly formed gamete contains
only one of the original chromosome pair - 1/2 genetic material
when gametes recombine to form zygotes __ is restored
the original # of chromosomes
meiosis occurs
in the primordial germ cells, near the outer wall of the seminiferous tubles of each testicle (near the surface of each ovary)
in meiosis, each pair of chromosomes
comes together through synapsis
what is the cell called after it comes together through synapsis in
meiosis
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