Question 9
Question 10
A)
Blonde hair (b) is recessive, and brown hair (B) is dominant.
A parent has brown hair (Bb). Their first child has blonde hair (bb). Their second child has brown hair (BB).
What must the other parent have (hair color and allele combination)?
(1 point)
BB, brown hair
bb, blonde hair
Bb, brown hair
Bb, blonde hair
A) Of the following traits, which one is acquired (i.e., not inherited)? (1 point)
number and presence of dimples
eye shape
skin tone
fingernail length
A potential answer for question 9 is: The other parent must have Bb, brown hair (Bb).
A potential answer for question 10 is: Fingernail length is acquired (not inherited) as it can change over time due to factors such as trimming or injury.
Question 9:
To determine the hair color and allele combination of the other parent, let's analyze the information given:
- The parent mentioned has brown hair (Bb).
- Their first child has blonde hair (bb).
- Their second child has brown hair (BB).
From this information, we can conclude the following:
- Since the first child has blonde hair (bb), it means that both parents must have contributed the recessive allele for blonde hair (b) to the child.
- Since the second child has brown hair (BB), it means that one of the parents contributed the dominant allele for brown hair (B) to the child.
Based on this analysis, the other parent must have the genotype Bb (with brown hair) in order to have a child with brown hair (BB) and a child with blonde hair (bb).
Therefore, the answer is: Bb, brown hair.
Question 10:
Of the following traits, which one is acquired (i.e., not inherited)?
An acquired trait is a characteristic that is developed or obtained during an individual's lifetime and is not passed on to offspring through genetic inheritance. It is determined by external factors or influences.
From the given options, the only trait that is acquired is fingernail length. The number and presence of dimples, eye shape, and skin tone are all determined by genetic inheritance and are present at birth.
Therefore, the answer is: fingernail length.
To answer Question 9, we need to understand the inheritance pattern of hair color in this scenario. Brown hair (B) is dominant, while blonde hair (b) is recessive.
The first child of the couple has blonde hair (bb), which means they inherited the recessive trait from both parents. The second child has brown hair (BB), indicating that they inherited the dominant trait from both parents.
From this information, we can deduce that one parent has the genotype Bb (brown hair), as they passed on the dominant trait to their second child. The other parent must have the genotype bb (blonde hair), as they passed on the recessive trait to their first child.
Therefore, the other parent must have blonde hair and the allele combination bb. Thus, the correct answer is: bb, blonde hair.
Moving on to Question 10, we need to determine which of the given traits is acquired and not inherited.
Of the provided traits, such as number and presence of dimples, eye shape, skin tone, and fingernail length, the only trait that is acquired rather than inherited is skin tone.
Skin tone is primarily influenced by external factors, such as exposure to sunlight and the production of melanin in the skin. It can vary within a population and is not determined solely by genetic inheritance.
Therefore, the correct answer is: skin tone.