Q11: When several genes are considered together, the proportion of homozygotes... - Cell Biology, Genetics, Physiology, Biochemistry & Plant Protection - ICAR AIEEA PG Plant Sciences 09 July 2023 (Shift 1) Paper

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ICAR AIEEA PG Plant Sciences 09 July 2023 (Shift 1) Paper

MCQ (Single Correct) +4 −1

When several genes are considered together, the proportion of homozygotes for all the genes in a backcross generation in self-pollinated crops is given by the formula

जब कई जीनों को एक साथ लिया जाता है, तो स्व-परागित फसलों में बैकक्रॉस पीढ़ी में सभी जीनों के लिए समयुग्मजियों का अनुपात किस सूत्र द्वारा दिया जाता है?

[(2m + 1) / 2^m]^n [(2m + 1) / 2^m]^n [(2^m - 1) / 2^n]^m [(2^m - 1) / 2^n]^m [(2m + 1) / 2^n]^m [(2m + 1) / 2^n]^m [(2^m - 1) / 2^m]^n [(2^m - 1) / 2^m]^n

In self-pollinating crop genetics and backcross breeding, consider $n$ independent heterozygous gene pairs segregating over $m$ generations of selfing or backcrossing.
For a single gene pair ($n = 1$) after $m$ generations of selfing, the proportion of homozygotes is:
$$\text{Homozygote proportion for 1 gene} = \frac{2^m - 1}{2^m}$$
Assuming independent assortment across $n$ unlinked gene loci, the probability that an individual is completely homozygous for all $n$ genes simultaneously is the product of the individual probabilities:
$$\text{Proportion of homozygotes for } n \text{ genes} = \left[\frac{2^m - 1}{2^m}\right]^n$$
Hence, the correct formula is [(2^m - 1) / 2^m]^n (Option 4).

स्व-परागित फसलों और बैकक्रॉस प्रजनन में यदि $n$ स्वतंत्र जीनों के लिए $m$ पीढ़ियों तक स्व-परागण कराया जाए:
एकल जीन ($n = 1$) के लिए $m$ पीढ़ियों के उपरांत समयुग्मजी (Homozygote) पौधों का अनुपात होता है:
$$\frac{2^m - 1}{2^m}$$
जब $n$ स्वतंत्र रूप से अपव्यूहन करने वाले जीनों को एक साथ लिया जाता है, तो सभी $n$ जीनों के लिए पूर्णतः समयुग्मजी होने का अनुपात स्वतंत्र प्रायिकताओं के गुणनफल के बराबर होता है:
$$\left[\frac{2^m - 1}{2^m}\right]^n$$
अतः सही सूत्र [(2^m - 1) / 2^m]^n (विकल्प 4) है।

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report Mismatch त्रुटि बताएं

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Q11: When several genes are considered together, the proportion of homozygotes... - Cell Biology, Genetics, Physiology, Biochemistry & Plant Protection - ICAR AIEEA PG Plant Sciences 09 July 2023 (Shift 1) Paper | Agrigyan

Previous Year Papers of Plant Sciences

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