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Biology
Inheritance
Inheritance of sex
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Created by
Daniyal Zaman
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Cards (11)
How many pairs of chromosomes do humans have?
23
pairs
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What do the 22 pairs of chromosomes determine?
Inherited characteristics
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What are the sex chromosomes in males?
X and Y
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What are the sex chromosomes in females?
X
and
X
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How do the gametes of a female differ from those of a male regarding sex chromosomes?
Females
have only
X chromosomes
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What is the composition of male gametes regarding sex chromosomes?
Half
X and half Y chromosomes
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If a couple has offspring, what are the possible combinations of sex chromosomes?
XX
for female,
XY
for male
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What is the average ratio of female to male offspring?
1 to 1
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Why might a couple have several offspring of the same sex?
Because of
probabilities
in inheritance
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Where can students find questions on the inheritance of sex?
In the
revision
workbook
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What are the key points about sex chromosome inheritance?
Males have
XY
chromosomes
Females have
XX
chromosomes
Female
gametes
contain only X chromosomes
Male gametes contain X and Y chromosomes
Offspring can be XX (female) or XY (male)
Average ratio of
female
to male is
1:1
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