Biology Chapter 11B Multiple Choice
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15 Terms
Has both members of each homologous pair
somatic cells
diploid
zygote
Has one member of each homologous pair
Reproductive cells
gametes
eggs and sperm
haploid
Why do we have homologous chromosomes?
because we are the result of sexual reproduction
Why does it make sense for gametes to be haploid (1)
because they have to fuse
Why does it make sense for gametes to be haploid (2)
if the chromosomes number wasn't reduced then chromosome number would be different in the offspring
How are haploid gametes produced from diploid somatic cells
via meiosis
Meiosis (1)
The process of nuclear division that reduces the chromosome number by half
Meiosis (2)
the production of gametes
Meiosis (3)
involves one replication and two divisions
What is the result of meiosis
four haploid daughter cells
What is the significance of crossing over (1)
new allele combinations are created
What is the significance of crossing over (2)
the chromosomes are different afterwards than those of the cell they started in
What is the significance of crossing over (3)
allows for genetic variety
Why is genetic variation an advantage
it allows the species a greater chance of surviving changes in the environment
Why does the egg need to be so large
because the excess cytoplasm serves as nutrition for the developing embryo prior to implantation