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Questions and Answers
What is the result when a child inherits one tongue-rolling gene and one non-rolling gene?
What is the result when a child inherits one tongue-rolling gene and one non-rolling gene?
- The child will be a non-tongue-roller.
- The child will be a tongue-roller. (correct)
- The child's ability to roll their tongue is uncertain.
- The child must inherit two non-rolling genes to roll their tongue.
Which genotype represents a heterozygous individual in the tongue-rolling gene?
Which genotype represents a heterozygous individual in the tongue-rolling gene?
- Tt (correct)
- tt
- T
- TT
What is the probability of a child being a non-tongue-roller if both parents are heterozygous (Tt)?
What is the probability of a child being a non-tongue-roller if both parents are heterozygous (Tt)?
- 50%
- 25% (correct)
- 100%
- 0%
How many alleles determine the A and B blood group phenotypes?
How many alleles determine the A and B blood group phenotypes?
In the context of blood group inheritance, which genotype would result in blood group AB?
In the context of blood group inheritance, which genotype would result in blood group AB?
Why can a recessive gene only be expressed if both chromosomes have it?
Why can a recessive gene only be expressed if both chromosomes have it?
Which of the following statements about sex-linked inheritance is correct?
Which of the following statements about sex-linked inheritance is correct?
What do the letters TT, Tt, and tt represent in the context of tongue-rolling gene inheritance?
What do the letters TT, Tt, and tt represent in the context of tongue-rolling gene inheritance?
What is the main purpose of using Punnett squares in genetics?
What is the main purpose of using Punnett squares in genetics?
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Study Notes
Tongue-Rolling Inheritance
- Tongue-rolling is a dominant trait, meaning only one copy of the tongue-rolling gene is needed for an individual to express the trait.
- Individuals who cannot roll their tongues are homozygous for the recessive gene.
- A Punnett square is a diagram used to predict the probability of inheriting specific traits.
- A Punnett square for tongue-rolling with heterozygous parents will show a 75% chance of a child inheriting the tongue-rolling gene.
Blood Group Inheritance
- Blood type is determined by the presence or absence of specific antigens on the surface of red blood cells.
- There are four possible alleles for blood type: A, B, AB, and O.
- An individual may inherit different combinations of these alleles, resulting in different blood types.
- A Punnett Square can be used to predict the possible blood types of offspring.
- For example, if one parent has blood type A (genotype AA) and the other has blood type B (genotype BB), their child could have any of the following blood types: AB, A, or B.
Sex-Linked Inheritance
- The X chromosome is much larger than the Y chromosome and carries many more genes.
- Most genes on the X chromosome are not related to sex determination.
- Sex-linked inheritance refers to traits determined by genes located on the sex chromosomes.
- Examples of sex-linked traits include hemophilia and red-green color blindness.
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