تمارين أونلاين Biology | Sex determination in human

A – The presence of the X chromosome

B – The number of X chromosomes

C – Having the same reproductive organs

D – The absence of the Y chromosome

A – Only an ovum with an X chromosome can determine the gender of the baby.

B – A sperm with an X chromosome cannot determine the gender of the baby.

C – Only an ovum with a Y chromosome can determine the gender of the baby.

D – A sperm with a Y chromosome can determine the gender of the baby

A – It is a normal cross of one trait following the law of complete dominance.

B – The recessive alleles of the parents combine in their offspring to produce dominant phenotypes.

C – Each parent has a dominant allele which was passed down to their offspring.

D – It is a normal cross of two traits following Mendel’s law.

a-X        b-2X             c- X -1               d-2X-2

a- klinfelter syndrome                              b- turnner syndrome

c- a male with Down syndrome              d- a female wiyh down syndrome

A – Only males are affected by Turner’s syndrome.

B – Patients with several deformations.

C – The number of chromosomes in somatic cells of patients with Turner’s syndrome is 2n-.2

D – Patients suffer from mental retardation.

A – Partial deafness

B – Myopia

C – Cervical cancer

D – Infertility

44 somatic and 2 sex chromosomes?

A – The embryo will develop into a female child.

B – The embryo will not develop and will die.

C – The embryo will lack female hormones.

D – The embryo will develop into a male child.

a- week 6          b-week 12          c-week 0            d-week 2

A – Because they are formed by the mitotic division of certain cells in gonads.

B – Because they are formed by the meiotic division of certain cells in gonads.

C – Because they are formed by the binary fission of certain cells in gonads.

D – None of the answers are correct

following, except…..

a – the type of division from which they are produced

b- the number of chromosomes that they carry

c –  the location of chromosomes in each of them

d – the karyotype of each of them

a – 23 pairs

b – 44

a – 23 pairs

b – 23

a – 23

b – 46

a – 23

b – 23 pairs

a. The sperm is similar to the ovum in the number of autosomes

b. The sperm is similar to the ovum in the number of sex chromosomes

c. The sperm and the ovum contain half the number of chromosomes in the

somatic cells

d. The sperm and the ovum are responsible for the sex determination.

a- normal mother and father

b-father with infantile dementia with normal mother

c-normal father and mother with turner syndrome

d-father with klinfeiter and normal mother

a-normal sperm              b- normal ovum

c-abnormal ovum          d- (a) or (b)