1.1.5 A cross between two true breeding lines, one with dark blue flowers and one with bright white flowers, produces F1 offspring that are light blue. When the F1 progeny are crossed, a 1:2:1 ratio of dark blue to light blue to white flowers is observed. What genetic phenomenon is consistent with these results?

A) Epistasis
B) Incomplete dominance
C) Codominance
D) Random mating

1.1.6 An individual has different alleles for a particular gene in each of the chromosomes.

A) Homozygous
B) Mitosis
C) Heterozygous
D) Meiosis

1.1.7 The proportion of observable differences between individuals due to genetics is:

A) Mutualism
B) Heritability
C) Atavism
D) Biometrics

1.1.8 A selection method that focuses on the quality of the ancestors rather than an individual is:

A) Artificial selection
B) Natural selection
C) Mass selection
D) Pedigree selection

1.1.9 The passing on of characteristics from one generation to the next is:

A) Homozygous
B) Heterozygous
C) Dominant
D) Heredity

1.1.10 The stage of meiosis in which chromosomes pair and cross over is:

A) Prophase 1
B) Metaphase 1
C) Prophase 2
D) Metaphase 2

Let's address each question one by one based on the information provided:

1.1.5 Genetic Phenomenon: Incomplete Dominance

In incomplete dominance, the heterozygote exhibits a phenotype that is an intermediate of the two homozygous phenotypes. In the case of the cross between the true breeding lines with dark blue and bright white flowers resulting in light blue flowers in F1, it suggests that neither allele is completely dominant over the other. When the F1 progeny are crossed, a 1:2:1 phenotypic ratio is observed—1 part dark blue (homozygous), 2 parts light blue (heterozygous), and 1 part white (homozygous). This 1:2:1 ratio is characteristic of incomplete dominance. Therefore, the answer is B) Incomplete dominance .


1.1.6 Individual with Different Alleles: Heterozygous

A heterozygous individual has two different alleles for a particular gene, one on each of the homologous chromosomes. This contrasts with a homozygous individual, who has two identical alleles for a particular gene. Therefore, the answer is C) Heterozygous .


1.1.7 Proportion of Observable Differences Due to Genetics: Heritability

Heritability is a measure of how much of the variation in observable traits (phenotypic variation) is due to genetic factors. It is a proportion, not a specific value, indicating the genetic contribution to differences in a trait within a population. Therefore, the answer is B) Heritability .


1.1.8 Selection Method Focusing on Ancestors: Pedigree Selection

Pedigree selection is a method where the breeding value of an individual is assessed based on the performance and quality of its ancestors. This method contrasts with mass selection, which focuses more on the individual's traits. Therefore, the answer is D) Pedigree selection .


1.1.9 Passing Characteristics to the Next Generation: Heredity

Heredity refers to the process by which traits are passed from parents to offspring through genes. This involves the transmission of genetic information across generations. Therefore, the answer is D) Heredity .


1.1.10 Stage of Meiosis Where Chromosomes Pair and Cross Over: Prophase 1

During prophase 1 of meiosis, homologous chromosomes pair up in a process called synapsis and exchange genetic material through crossing over. This is a crucial step in meiosis that increases genetic diversity. Therefore, the answer is A) Prophase 1 .

Answered by danjohnbrain | 2025-07-06

The answers to the questions are: 1. B) Incomplete dominance, 2. C) Heterozygous, 3. B) Heritability, 4. D) Pedigree selection, 5. D) Heredity, and 6. A) Prophase 1.
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Answered by danjohnbrain | 2025-07-07