An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slanting eyes, permanently open mouth with projecting upper lip and short stature. This abnormality can be attributed to

  • A

    An extra $Y$ chromosome

  • B

    An extra $X$ chromosome

  • C

    An extra chromosome in the $21^{st}$ pair of autosomes

  • D

    Absence of $X$ chromosome leading to a total of $45$ chromosomes instead of the normal $46$

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  • [NEET 2023]

Match list I with List $II$ and select the correct answer using code given below

List $I$ $(syndrome)$

$(1)$ Patau’s syndrome

$(2)$ Kline-Felter’s syndrome

$(3)$ Down’s syndrome

$(4)$ Turner’s syndrome

List $II$ $(Chromosomal\, abnormality)$

$(A)$ $44 + XXY = 47$

$(B)$ $44 + X = 45$

$(C)$ $46 + 1 = 47$, Chromosome $13^{th}$

$(D)$ $46 + 1 = 47$, Chromosome $21^{st}$ Code

Euploidy is best explained by

What is Down’s syndrome ? Give its symptoms and cause. Why is it that the chances of having a child with Down’s syndrome increases if the age of the mother exceeds forty years ?

Gamete mother cells of the chromosome $44+ XY$ suffers from non-disjunction at first meiotic division. Which of the following set of gametes would result?