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5) In humans, brown eyes (B) are dominant over blue eyes (b). Your person's mother is heterozygous for brown eyes, and the dad has pure brown eyes.

6) In humans, long eyelashes (L) are dominant over short eyelashes (l). Your person's father is pure for long eyelashes, and the mother has pure short eyelashes.

7) In humans, nose length is an example of incomplete dominance. Long noses (LL) when crossed with short noses (SS) produce medium-sized noses (LS). Both your mother and father have medium-sized noses.

Answer :

The question involves three different characteristics, eye color, eyelash length, and nose length. We will address each of them one by one:

1. Eye color Brown eyes are dominant over blue eyes. The mother is heterozygous brown-eyed, which means she has one dominant brown allele (B) and one recessive blue allele (b).

The father has pure brown eyes, which means he is homozygous dominant (BB).Let's use Punnett squares to predict the possible eye colors of the offspring. The mother's genotype is Bb, and the father's genotype is BB.

We can set up the Punnett square like this:| | B | B|---|---|---|B| BB | BB|B| Bb | Bb The Punnett square shows that there is a 100% chance of the offspring having brown eyes. All the offspring will have the genotype Bb because the mother is heterozygous. Therefore, all the offspring will have brown eyes.

2. Eyelash lengthLong eyelashes are dominant over short eyelashes. The father is pure for long eyelashes, which means he is homozygous dominant (LL).

The mother has pure short eyelashes, which means she is homozygous recessive (ll).Let's use Punnett squares to predict the possible eyelash lengths of the offspring.

The mother's genotype is ll, and the father's genotype is LL. We can set up the Punnett square like this:| | L | L|---|---|---|l| Ll | Ll|l| Ll | LlThe Punnett square shows that there is a 100% chance of the offspring having long eyelashes.

All the offspring will have the genotype Ll because the father is homozygous dominant. Therefore, all the offspring will have long eyelashes.

3. Nose lengthNose length is an incomplete dominant trait. When long noses (BB) are crossed with small noses (SS), medium-sized noses (BS) are produced.

Both parents have medium noses, which means they are both heterozygous (Bb).Let's use Punnett squares to predict the possible nose lengths of the offspring.

The mother's genotype is Bb, and the father's genotype is Bb. We can set up the Punnett square like this:| | B | b|---|---|---|B| BB | Bb|b| Bb | bb The Punnett square shows that there is a 25% chance of the offspring having a small nose (bb),

A 50% chance of the offspring having a medium-sized nose (Bb), and a 25% chance of the offspring having a long nose (BB). Therefore, the offspring have a 50% chance of having a medium-sized nose, which is the same nose length as both parents.

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