MCQ
Heterogamesis is:
- AFormation of two types of gametes
- BMorphological distinction of male and female gametes
- CFormation of two types of gametes by one sex and one type by other sex
- DFormation of two types of gametes by both the sexes
Explanation:
Heterogamesis: forming two kinds of gametes of which one produces male offspring and the other female offspring. Heterogametic sex (digametic sex) refers to the sex of a species in which the sex chromosomes are not the same. For example, in humans, males, with an X and a Y sex chromosome, would be referred to as the heterogametic sex, and females having two X sex chromosomes would be referred to as the homogametic sex.
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$I$. In the absence of adenosine deaminase enzyme, purine metabolism is disturbed and $T-$lymphocytes fails to function $II$. $ADA$ deficiency is caused by the deletion of the gene for $ADA$
$III$. In some cases, it can be cured by bone marrow transplantation and enzyme replacement therapy. But in both approaches, the patients are not completely cured
$IV$. For permanent cure, genes isolated from the bone marrow cells producing $ADA$ at early embryonic stages can be a possible cure
Which of the above statements are correct?