Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Read the following and answer any four questions from (i) to (v) given below:
While studying inheritance of characters, a teacher gave the example of inheritance of attached earlobe and hypertrichosis of the ear to her students. A man with attached earlobes and extensive hair on pinna married a woman having free earlobes. The couple had four children, one son with attached earlobes and hairy pinna, one son with a free earlobes and hairy pinna and two daughters with attached earlobes. One of the daughters married a man with free earlobes and sparse hair on pinna. Teacher said if this couple would have sons there would be equal chances for both having free or attached earlobes and sparse hair on pinnae.

1. Attached and free earlobe are respective example of?

1. Dominant and recessive traits.
2. Recessive and recessive traits.
3. Recessive and dominant traits.
4. Dominant and dominant traits.

2. Hypertrichosis of the ear is.

1. X linked trait
2. Y linked trait
3. Autosomal dominant trait
4. Autosomal recessive trait.

3. If a female with attached earlobe married a male homozygous for free earlobe sparse hair on pinna then what would be the chances of daughter to have attached earlobe?

1. 0%
2. 100%
3. 25%
4. 75%

4. If a man with attached earlobe and hairy pinna married a woman with attached earlobe then what would be the chances of son to have hairy pinna?

1. 50%
2. 100%
3. 75%
4. 0%

5. A male with attached earlobe, sparse hair on pinna married a female with attached earlobe. Which of the following is correct regarding their progenies?

1. All sons have a free earlobe with hairy pinna.
2. All daughters have an attached earlobe.
3. 50% daughters have an attached earlobe whereas 50% daughters have a free earlobe.
4. 50% sons have attached earlobe with hairy pinna and 50% sons have a free earlobe