Human Reproduction — BIOLOGY STD 12 Science — Question

Name the placental mammals corresponding to the Australian 'spotted cuscus' and Tasmanian 'tiger cat', which have evolved as a result of convergent evolution.

Define transformation.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross.

In the United States, the total number of STDs of bacterial origin remains about the same each year, but the total number of STDs of viral origin increases each year. Explain the reason for this.

Write the sex of a human having XXX sex chromosomes along with 22 pairs of autosomes. Name the disorder this human suffers from.

Mark the odd one in the following group.
Mango, Apple, Strawberry, Cashew.

Two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: GM foods are facing widespread resistance by the people.
Reason: GM foods have mutated genes which cause infections and allergies.

Name the interaction in the following:
Ascaris worms living in the intestine of humans.

Name the protein produced in transgenic animals that is used to treat emphysema.

How much is one map unit for expressing distances between genes on a chromosome?