Some humans are able to roll their tongue, while others are not. Two parents (both tongue-rollers) have four children, all of whom are not tongue-rollers. Which of the following statements hold true regarding this?
(i) The allele for tongue-rolling is dominant
(ii) The probability that their next child will be a tongue-roller is 0.5.
(iii) The probability that their next child will not be a tongue-roller is 0.75.
(iv) Both parents have one allele for tongue-rolling and one allele for non-tongue-rolling.

(i) and (iii) only

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(i) and (iv) only

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(ii) and (iii) only

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(ii) and (iv) only

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Solution

The correct option is B (i) and (iv) only
In the given case the parents should be heterozygous, for tongue rolling character with genotype Tt. The probability that their next child will be a tongue roller is 0.75 while the probability of being a tongue roller is 0.25.

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Similar questions

Some humans are able to roll their tongue, while others are not. Two parents (both tongue-rollers) have four children, Some of them are tongue rollers and some of them are not. Which of the following statements hold true regarding this?
(i) The allele for tongue-rolling is dominant
(ii) The probability that their next child will be a tongue-roller is 0.5.
(iii) The probability that their next child will not be a tongue-roller is 0.75.
(iv) Both parents have one allele for tongue-rolling and one allele for non-tongue-rolling.

Q. Some humans are able to roll their tongue, while others are not. Two parents (both tongue-rollers) have four children, all of whom are not tongue-rollers. Which of the following statements hold true regarding this?
(i) The allele for tongue-rolling is dominant
(ii) The probability that their next child will be a tongue-roller is 0.5.
(iii) The probability that their next child will not be a tongue-roller is 0.75.
(iv) Both parents have one allele for tongue-rolling and one allele for non-tongue-rolling.

Q. Some humans are able to roll their tongue, while others are not. Two parents (both tongue-rollers) have children where not all are tongue-rollers. Which of the following statements hold true regarding this?

In humans, the ability to roll the tongue is a dominant trait. The inability to roll the tongue is a recessive trait. If two individuals homozygous recessive for this trait have a child, what is the chance that the child will be able to roll his tongue?

Q. Mendel has observed tallness as a dominant character in the garden pea plant. Similarly, tongue rolling is a dominant character in man. In a group of 60 students, 45 can roll their tongue and 15 are non-rollers. In the above context, calculate the percentage of dominant and recessive characters.

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The correct option is B (i) and (iv) onlyIn the given case the parents should be heterozygous, for tongue rolling character with genotype Tt. The probability that their next child will be a tongue roller is 0.75 while the probability of being a tongue roller is 0.25.

The correct option is B (i) and (iv) only
In the given case the parents should be heterozygous, for tongue rolling character with genotype Tt. The probability that their next child will be a tongue roller is 0.75 while the probability of being a tongue roller is 0.25.