Question

white eyed, male _______ red eyed female (heterozygous) __ white eyed, female _____ red eyed, male __ 3. show the cross of a white eyed female $x^r x^r$ with a red - eyed male $x^r y$. show the punnett square. 4. show a cross between a pure red eyed female and a white eyed male. show the punnett square. what are the genotypes of the parents: ________ & __ how many are: white eyed, male __ white eyed, female _ red eyed, male _____ red eyed, female __ multiple alleles 1. what are multiple alleles? 2. how many alleles does each individual inherit? 3. how are multiple alleles represented? 4. what is an example of a trait in humans that is determined by multiple alleles? 5. what are the three alleles that determine blood type? _ and _____ and ___________________ 6. which alleles are codominant? and _; which allele is recessive? __

Explanation:

Question 3

Step1: Identify parent gametes

White-eyed female $X^rX^r$ produces $X^r$ gametes. Red-eyed male $X^RY$ produces $X^R$ and $Y$ gametes.

Step2: Build Punnett Square

$$\begin{array}{c|cc} & X^R & Y \\ \hline X^r & X^RX^r & X^rY \\ X^r & X^RX^r & X^rY \\ \end{array}$$

Step1: Define parent genotypes

Pure red-eyed female: $X^RX^R$; White-eyed male: $X^rY$

Step2: Identify parent gametes

$X^RX^R$ produces $X^R$ gametes. $X^rY$ produces $X^r$ and $Y$ gametes.

Step3: Build Punnett Square

$$\begin{array}{c|cc} & X^r & Y \\ \hline X^R & X^RX^r & X^RY \\ X^R & X^RX^r & X^RY \\ \end{array}$$

Step4: Count offspring phenotypes

Count each phenotype from the square.

1. Multiple alleles refer to three or more variants of a single gene that occupy the same locus on a chromosome, leading to different trait expressions.
2. Each individual inherits 2 alleles for a gene (one from each parent), even if multiple alleles exist in the population.
3. Multiple alleles are represented using a base letter for the gene, with superscripts to denote different alleles (e.g., $I^A$, $I^B$, $i$ for blood type).
4. Human ABO blood type is a common trait determined by multiple alleles.
5. The three alleles for ABO blood type are $I^A$, $I^B$, and $i$.
6. $I^A$ and $I^B$ are codominant (both expressed together), while $i$ is recessive (only expressed in homozygous form).

Answer:

Punnett Square:

$$\begin{array}{c|cc} & X^R & Y \\ \hline X^r & X^RX^r & X^rY \\ X^r & X^RX^r & X^rY \\ \end{array}$$

Offspring: 2 red-eyed females ($X^RX^r$), 2 white-eyed males ($X^rY$)

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Question 4