The diagram shows an age structure for the population of Thailand in the 1960s. Which of the following conclusions about the pop
ulation are supported by the age structure? Select the three correct responses.
A. Women in this population are having, on average, more than three children each.
B. The population has a large proportion of seniors over the age of 65.
C. The birthrate in this population is very low.
D. The population is in a period of rapid growth.
E. The population has a large proportion of youth under the age of 25.
A. Women in this population are having, on average, more than three children each.
B. The population has a large proportion of seniors over the age of 65.
C. The birthrate in this population is very low.
D. The population is in a period of rapid growth.
E. The population has a large proportion of youth under the age of 25.
1 answer:
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Explanation:
a) The allele for hemophilia is Xh and that for normal is XH.
Crossing a hemophiliac male, Xh Y, with a normal female XH XH,
- XH Xh, normal carrier female
- XH Xh, normal carrier female
- XH Y, normal male
- XH Y, normal male
b) Both parents are normal and children still having hemophilia means that the mother is a carrier.
Let's see how it'll work out if we cross a normal male with a carrier female,
XH Y × XH Xh
- XH XH, normal female
- XH Xh, carrier female
- XH Y, normal male
- Xh Y, hemophiliac male
This means that the possibility of a female being normal, a carrier or not, is 100%. The possibility of a male being normal is 50% and the possibility of him being a hemophiliac is also 50%.
Thus it's possible that all 7 sons get hemophilia as each male baby has a 50% chance of having the genotype Xh Y. And it makes sense that all the females are normal. Those females could have the genotypes XH XH, or XH Xh (carriers).
