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
An extra $Y$ chromosome
An extra $X$ chromosome
An extra chromosome in the $21^{st}$ pair of autosomes
Absence of $X$ chromosome leading to a total of $45$ chromosomes instead of the normal $46$
Broad palm with single palm crease is visible in a person suffering from-
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?