[The gene responsible for ...] Excessive growth of hair on the pinna is a feature found only in males because

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

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

The female sex hormone estrogen suppresses the character in females

The gene responsible for the character is present on the Y chromosome only

Additional Questions

The genotype is called a ______ when a person is heterozygous at two different loci.	Answer
Individuals with Down syndrome have ______ copies of chromosome 21.	Answer
The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by	Answer
When the effects of both alleles are equally expressed in the heterozygote which one of the followings occurs?	Answer
When a tall plant with round seeds (TTRR) crossed with a dwarf plant with wrinkle seeds (ttrr). The F₁ generation consists of tall plants with round seeds. What would be the proportion of dwarf plant with wrinkle seeds in F₁ generation?	Answer
An individual who has two different alleles of a gene is called ______.	Answer
Nondisjunction may occur due to the failure of ______ chromosomes to separate properly in meiosis I.	Answer
Haploids are more suitable for mutation studies than the diploids. This is because	Answer
Which one of the followings is caused by a recessive allele of a gene on chromosome 7?	Answer
ABO blood groups in humans are controlled by the gene l. It has three alleles – lA, lB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?	Answer

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