Question

name: _________________________ period: date: _______
learning check 5a
\i can identify the probability of dominant and recessive traits
for cat hair lengths\
the diagram below shows a cross between two cats. use the diagram to
answer questions # 1-3.

inheritance of hair length in cats
h = short hair
h = long hair
diagram of two cats and punnett square with eggs h, h; sperm h, h; cells: hh, hh, hh, hh

1. what is the probability (%) that the offspring will have long hair? ______
2. what is the phenotype of offspring that are hh? ____________________
3. what length of hair is a dominant trait for the cats? ________________

(short hair / long hair)

Explanation:

Question 1

Step1: Count total offspring

From the Punnett square, there are 4 offspring: \( Hh, Hh, hh, hh \).

Step2: Count long - hair offspring

Long hair is represented by \( hh \). There are 2 offspring with \( hh \).

Step3: Calculate probability

Probability \(=\frac{\text{Number of long - hair offspring}}{\text{Total number of offspring}}\times100\%=\frac{2}{4}\times100\% = 50\% \)

The allele for long hair is \( h \), and when the genotype is \( hh \) (homozygous recessive), the phenotype is determined by the recessive allele. Since \( h \) represents long hair, the phenotype of \( hh \) offspring is long hair.

The dominant allele is represented by a capital letter. Here, \( H \) represents short hair. In a genotype like \( Hh \), the dominant allele (\( H \)) determines the phenotype (short hair), so short hair is the dominant trait.

Answer:

\( 50\% \)

Question 2