Deck 1 (slides 1-6)
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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To analyze human chromosomes, scientists photograph cells in _________ (when chromosomes are _________).
Mitosis, visible
Next, they cut out the chromosomes from the photograph and group them together in _______.
Pairs
A picture of chromosomes in pairs is called a __________.
Karyotype
A karyotype allows geneticists to determine if there are any extra or missing __________.
Chromosomes
A karyotype allows geneticists to determine if there are any _________ chromosomes.
Broken
A karyotype allows geneticists to determine the ______ of the person.
Sex
Humans have ____ chromosomes, ____ pairs.
46,23
The 23rd pair of chromosomes is the ______ chromosomes.
Sex
There are 2 types of sex chromosomes, ____ and ____.
X, Y
The ____ chromosomes is large, the ___ chromosomes is small.
X, Y
A person with 2 X chromosomes (XX) is a ______.
Girl
A person with an X and a Y chromosome (XY) is a ______.
Boy
The other 22 pairs of chromosomes are called __________ (these DO NOT determine the sex of a human).
Autosomes
The chance of having a boy or girl baby is _______.
50/50
All human egg cells carry a single ____ chromosome (22, X).
X
Half of all sperm cells carry an ____ chromosome (22, X) and half carry a ____ chromosome (22,Y).
X, Y
Studying human inheritance of traits is ________ than studying inheritance in peas or flies.
Harder
This is because humans have ______ offspring and longer __________ times between offspring.
Less, generational
To study the inheritance of traits in humans, scientists usually study _______ passes over many generations in a _________.
Traits, family
To study hereditary traits in humans, scientists use a chart called a _________.
Pedigree