Excessive growth of hair on pinna is a feature found only in males because

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4.Principles of Inheritance and Variation

normal

Excessive growth of hair on the pinna is a feature found only in males because

The female sex hormone oestrogen suppresses the character in females

The gene responsible for the character is present on the $Y-$chromosomes only

The gene responsible for the character is recessive in females and dominant only in males

The character is induced in males as males produce testosterone

Solution

Genes in the non-homologous region of $Y-$chromosome pass directly from male to male. In man, the $Y-$linked or holandric genes such as ichthyosis, hystrix, gravis hypertrichosis (excessive development of hairs on pinna of ear) are transmitted directly from father to son.

Standard 12

Biology

The following diagram shows two chromosomes and the lettered number represents the genes

chromosome $1$ :

$P$ $Q$ $R$ $S$ $T$ $U$ $V$
$W$

chromosomes $2$ :

$E$ $F$ $G$ $H$

Which of the following would result if a translocation occurred between chromosome $1$ and $2 ?$

normal

Number of linkage group in Pisum sativum is

normal

The point mutations $A$ to $G, C$ to $T, C$ to $G$ and $T$ to $A$ in $DNA$ are

normal

In erythroblastosis foetalis, which factors of the mother pass through placenta into the foetus

normal

Expected children of a blue-eyed $(recessive)$ woman and brown-eyed $(dominant)$ man who had a blue-eyed mother are likely to be

normal

(AIPMT-1991)

Excessive growth of hair on the pinna is a feature found only in males because

Solution

Similar Questions

The following diagram shows two chromosomes and the lettered number represents the genes chromosome $1$ : $P$ $Q$ $R$ $S$ $T$ $U$ $V$ $W$ chromosomes $2$ : $E$ $F$ $G$ $H$ Which of the following would result if a translocation occurred between chromosome $1$ and $2 ?$

Number of linkage group in Pisum sativum is

The point mutations $A$ to $G, C$ to $T, C$ to $G$ and $T$ to $A$ in $DNA$ are

In erythroblastosis foetalis, which factors of the mother pass through placenta into the foetus

Expected children of a blue-eyed $(recessive)$ woman and brown-eyed $(dominant)$ man who had a blue-eyed mother are likely to be

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The following diagram shows two chromosomes and the lettered number represents the genes

chromosome $1$ :

$P$ $Q$ $R$ $S$ $T$ $U$ $V$
$W$

chromosomes $2$ :

$E$ $F$ $G$ $H$

Which of the following would result if a translocation occurred between chromosome $1$ and $2 ?$