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The normal body colour of a grasshopper...

The normal body colour of a grasshopper is green . The gene for this character is present on X chromosome. Due to recessive mutation in this gene , grasshoppers with pink body colour are produced . A male grasshopper with green body colour mates with a female grasshopper with pink body colour . Which of these statements is true ?

A

All offsprings will be green irrespective os sex.

B

All offsprings will be pink irrespective os sex.

C

50% daughters will be green and 50% sons will be pink.

D

All the daughters will be green and all the sons will be pink.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, let's break it down step by step: ### Step 1: Understand the Genetics The normal body color of grasshoppers is green, which is determined by a gene located on the X chromosome. The pink body color is a result of a recessive mutation in this gene. ### Step 2: Identify the Genotypes - **Male Grasshopper (Green Body Color)**: Since males have one X chromosome and one Y chromosome, the genotype for the male with green body color is represented as **XO** (where O indicates the absence of a second X chromosome). - **Female Grasshopper (Pink Body Color)**: The female with pink body color has two X chromosomes, both carrying the recessive mutation. Therefore, her genotype is **XpXp** (where Xp represents the X chromosome with the pink mutation). ### Step 3: Determine the Gametes - The male (XO) can produce one type of gamete: **X** (the X chromosome). - The female (XpXp) can produce two types of gametes: **Xp** (the X chromosome with the pink mutation). ### Step 4: Perform the Cross Now, we can set up the cross between the male and female: - Male gametes: **X** - Female gametes: **Xp** The possible combinations of offspring from this cross are: 1. **Female Offspring**: XpX (green body color because the normal gene suppresses the pink mutation) 2. **Male Offspring**: XpO (pink body color) ### Step 5: Analyze the Offspring From the cross, we can conclude: - 50% of the offspring will be female (X from male and Xp from female) and will have green body color. - 50% of the offspring will be male (O from male and Xp from female) and will have pink body color. ### Conclusion The correct statement is: **All daughters will be green, and all sons will be pink.** ### Final Answer The correct answer is: **All the daughters will be green and all the sons will be pink.** ---
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