Question

name
reindeer genetics
punnett squares, genotypes, & phenotypes
since gregor mendel was so successful in his work with pea plants, santa needed his help to select for the best traits in his reindeer herd. use your knowledge of genetics to answer the following questions.
part 1: use data from the table to write phenotypes for these genotypes

trait	dominant	recessive
nose color	black (n)	red (n)
ability to fly	non - flyer(f)	can fly (f)

1. aa -
2. nn -
3. aa -
4. ff -
5. ff -

part 2: label the ornaments as homozygous (ho) or heterozygous (he)
ornaments: ff, nn, aa, nn, ff, aa
6.
7.
8.
9.
10.
11.
part 3: use the table above to write genotype(s) for these phenotypes

1. heterozygous tall antlers
2. red nose
3. black nose
4. cannot fly
5. homozygous tall antlers
6. can fly
7. heterozygous non - flyer
8. homozygous dominant nose

part 4: use punnett squares to answer the following questions. show your work.

1. fill in the punnett square if two red - nosed reindeer were to mate. what is the probability that their offspring will also have a red nose?

punnett square:

red nose
black nose
© schilly science

Explanation:

Step1: Analyze the genotype of red - nosed reindeer

Red nose is a recessive trait, and its genotype is \(nn\) (from the table: Nose Color - Dominant: Black (N), Recessive: Red (n)). So both parents (red - nosed reindeer) have the genotype \(nn\).

Step2: Set up the Punnett Square

When we cross two reindeer with genotype \(nn\), the Punnett Square will have the following setup:

	\(n\)	\(n\)
\(n\)	\(nn\)	\(nn\)

Step3: Calculate the probability

All the offspring genotypes are \(nn\), which corresponds to the red - nose phenotype. The number of red - nose (desired) outcomes is 4 (since all 4 cells in the Punnett Square have \(nn\)) and the total number of outcomes is 4. The probability \(P=\frac{\text{Number of red - nose outcomes}}{\text{Total number of outcomes}}=\frac{4}{4} = 1\) or \(100\%\).

Answer:

The probability that their offspring will have a red nose is \(100\%\) (or \(1\)). The Punnett Square is filled with \(nn\) in all four cells. For the counts: Red nose: 4, Black nose: 0.