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This question has three parts.

Red-green color blindness (b) is a recessive sex-linked trait. A colorblind male marries a normal female. Their daughter is colorblind. What is the genotype for their daughter?

11 answers

In the case of red-green color blindness being a recessive sex-linked trait, the gene responsible for this condition is located on the X chromosome. Here’s how we can determine the genotypes:

  1. Male Parent (Colorblind): Since colorblindness is recessive and he is colorblind, his genotype must be \( X^cY \), where \( X^c \) is the X chromosome carrying the colorblind allele and \( Y \) is the Y chromosome.

  2. Female Parent (Normal Vision): Since the mother is normal and color blindness is recessive, her genotype must be either \( XX \) (homozygous normal) or \( X^cX \) (heterozygous carrier). However, since they have a colorblind daughter, she must carry the colorblind allele, so her genotype is \( X^cX \).

  3. Daughter (Colorblind): The daughter must inherit one X chromosome from each parent. She can inherit \( X^c \) from her father (because he can only pass on his \( X^c \) chromosome) and must inherit \( X^c \) from her mother. Thus, her genotype is \( X^cX^c \).

Summary: The genotype for their daughter is \( X^cX^c \) (homozygous colorblind).

just one sentence pls and make it small

The genotype for their daughter is \( X^cX^c \) (homozygous colorblind).

Using the punnet square to show the genotypes of the cross between the parents. (1 point)

Here's a Punnett square to show the genotypes of the cross between the colorblind male (\(X^cY\)) and the normal female carrier (\(X^cX\)):

\[ \begin{array}{c|c|c} & X^c & X \ \hline X^c & X^cX^c & X^cX \ \hline Y & X^cY & XY \ \end{array} \]

Genotypes from the square:

  • \(X^cX^c\): Colorblind daughter
  • \(X^cX\): Carrier daughter (normal vision)
  • \(X^cY\): Colorblind son
  • \(XY\): Normal son

This shows the possible genotypes from the cross.

This question has three parts.



(1 point)
The two alleles for the snap dragons are red (R) and white (W). The heterozygous genotype is expressed as pink.

In snapdragons, flower color is controlled by

In snapdragons, flower color is controlled by incomplete dominance, where the heterozygous genotype (RW) results in a phenotype of pink flowers.

Part A:

Using the allele symbols, identify the genotype of a snapdragon flower that is white

(1 point)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
The genotype for a white snapdragon is Response area.
Question

The genotype for a white snapdragon is WW.

Part B:

If a red snapdragon is crossed with a white snapdragon what is the probability of producing pink flowered snapdragon?

(1 point)
The probability of producing pink flowered snapdragon is

The probability of producing a pink flowered snapdragon is 100%.

When a red snapdragon (RR) is crossed with a white snapdragon (WW), all offspring will have the genotype RW, resulting in pink flowers due to incomplete dominance.