1. Crossing over occurs at the beginning of meiosis. Which of the following stat
ID: 281118 • Letter: 1
Question
1.
Crossing over occurs at the beginning of meiosis. Which of the following statements is true about crossing over?
Crossing over does not produce chromosomes with new combinations of maternal and paternal alleles.
Crossing over occurs both during mitosis and meiosis.
Crossing over is a rare event and can only occur at one location along each pair of homologous chromosomes.
As a result of crossing over, the two sister chromatids of a replicated chromosome are no longer identical.
Crossing over involves the exchange of corresponding segments of DNA between sister chromatids.
2.
This pedigree shows the inheritance of an autosomal dominant disorder. II-1 and II-2 plan to have four children. What is the probability that 2 children will be affected and 2 will not?
14/32
3/8
5/16
1/16
6/8
3.
QUESTION 12
Calculate the Fixation index in the Subpopulation relative to the Total population based on the information provided.
0.09
0.03
0.19
0.29
Thanks
a.Crossing over does not produce chromosomes with new combinations of maternal and paternal alleles.
b.Crossing over occurs both during mitosis and meiosis.
c.Crossing over is a rare event and can only occur at one location along each pair of homologous chromosomes.
d.As a result of crossing over, the two sister chromatids of a replicated chromosome are no longer identical.
e.Crossing over involves the exchange of corresponding segments of DNA between sister chromatids.
2.
This pedigree shows the inheritance of an autosomal dominant disorder. II-1 and II-2 plan to have four children. What is the probability that 2 children will be affected and 2 will not?
Hint: First find the probability that a child has the disease, then use the formula for binomial distribution.
a.14/32
b.3/8
c.5/16
d.1/16
e.6/8
3.
QUESTION 12
Calculate the Fixation index in the Subpopulation relative to the Total population based on the information provided.
a.0.09
b.0.03
c.0.19
d.0.29
Thanks
Explanation / Answer
Answer : option C, D and E are true.
Crossing over happens between two homologous chromosomes and their sister chromatid. And it also happens only during meiosis. It involves exchange of genes. So the chromatid will no longer be similar.
Answer. Option D. 1/16
Answer. Option. B =.03
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