biology till chapter 3
The pair of sex chromosomes in the human female is characterized by all the following except that ........
it follows the chromosomes pair no.(7) in size
it is arranged at the end of chromosomes
it carries the number (23)
it is asymmetric
The Punnett square shows the phenotypes resulting from a cross between mice that are heterozygous for fur color. What are the missing alleles?
AB
aB
Ab
ab
Which syndrome is likely to be caused by the chromosomal abnormality shown in the karyotype provided?
Klinefelter syndrome
Down syndrome
Turner syndrome
polyploidy syndrome
Which syndrome will likely be developed as a result of the chromosomal abnormality shown in the karyotype provided?
Down syndrome
Turner syndrome
Klinefelter syndrome
polyploidy syndrome
A case of chromosomal abnormality resulted from the fertilization of an abnormal ovum (one that has an extra copy of X chromosomes) with a normal sperm. If you know that the fertilizing sperm carries a Y chromosome, which of the following statements is correct about this case?
This case is Klinefelter’s syndrome, and the resulting individual is an abnormal male with 47,XXY karyotype.
This case is Turner’s syndrome, and the resulting individual is an abnormal female with 45 chromosomes in her somatic cells.
This case is polyploidy, and the resulting individual is an abnormal female with some male physical features.
This case is Down’s syndrome, and the resulting individual is an abnormal male with 45,XY karyotype.
The genotype which leads to the appearance of pink colour in the flowers of pea flower plant is ........
Aabb
AaBb
aaBB
aabb
Which of the following correctly describes the chromosomes contained within a human female somatic cell?
44 autosomes + XY
23 autosomes + XY
44 autosomes + XX
23 autosomes + XX
A human somatic (body) cell contains 46 chromosomes. How many chromosomes does a gamete (sex cell) contain?
When crossing RW x WW according to the lack of dominance principle , the resulted generation will have .......
three different genotypes and two different phenotypes
three different genotypes and three different phenotypes
two different genotypes and one phenotypes
two different genotypes and two different phenotypes
A man whose blood group is (A) married to a woman has the same blood group , what is the genotype that would not appear in the offspring ?
AO
AA
BO
OO
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