EBK BIOLOGY
5th Edition
ISBN: 8220101337627
Author: Maier
Publisher: PEARSON
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Chapter 8, Problem 2LTB
Summary Introduction
To detrmine:
The meaning of the sentence,' a gene has multiple allele'.
Whether a gene can have more than two allele for a single trait.
Introduction:
The allele is the form of a single gene present in an organism. The different combination of the alleles determines the genotype and
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Why are some alleles dominant to other alleles?
What are two of the same alleles for a trait?
How do geneticists know whether a particular trait is caused by the alleles of one gene or by two genes interacting in one of a number of possible ways?
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- What is Mendel’s law of segregation? Allele pairs separate during the formation of gametes, and pair back up upon fertilisation. During meiosis, the alleles of two or more genes separate into the gametes independent of each other. During meiosis. genetic material segregates equally into the resulting gametes. The separation of alleles into different gametes results in genetically distinct offspring. During meiosis, genes that are in close proximity on the genome are more likely to cross over together.arrow_forwardWhy are some alleles dominant and some recessive?arrow_forwardIn humans, the alleles for unattached earlobes is dominant over the allele for attached earlobes. The allele for dark hair dominates the allele for light hair. If both parents are heterozygous for earlobe attachment and hair color, what types of offspring can they produce, and what is the probability for each type?arrow_forward
- What is a dimorphism? A trait with two distinct forms originating from the interaction of two alleles of a single gene A trait with three or more distinct forms linked to multiple alleles of a single gene A trait consisting of a continuous spectrum of forms influenced by the interaction of multiple genes and multiple allelesarrow_forwardIf there are five alleles at a locus, how many genotypes can there be at this locus? How many different kinds of homozygotes can there be? How many genotypes and homozygotes can there be with eight alleles at a locus?arrow_forwardWhat is the phenomenon of a single gene determining a number of distinct and seemingly unrelated characteristics?arrow_forward
- Eye Color is a trait that involves a number of genes. To simplify our example, we can break down the traitinto two phenotypes: dark color and light color eyes. Dark coloration is considered dominant, or isexpressed in a heterozygous condition (when the alleles are different).Q: If you have one light eyed parent and one parent that is homozygous for dark eye color, what are thepotential eye colors of their offspring (young)? To start, what do the Parents’ alleles look like? What istheir Genotype? (Remember, you pick which letter you want to use)Light eye colored parent:Dark eye colored parent:One of the things Mendel designed was a way to provide information about how the genes are passed onfrom parent to offspring. He designed something called a Punnett Square. This square places the parents’alleles outside the box, then uses those alleles to fill in the squares.Let’s start with a reminder of what we know about the parents: Parent Phenotype(appearance) Genotype(alleles) 1 2arrow_forwardHow are the alleles of a gene different from each other? What is its importance?arrow_forwardWhat does a phenotype ratio of 3:1 among offspring in a monohybrid cross indicate? The alleles that govern one trait assort into gametes together with the alleles that govern another trait. The alleles that govern one trait assort into gametes independently of alleles that govern another trait. It indicates that the alleles governing the phenotypes do not follow a Mendelian inheritance pattern. It indicates that the alleles governing the phenotypes follow a Mendelian inheritance pattern.arrow_forward
- What are genes with more than one common allele?arrow_forwardFor some traits, one allele is not completely dominant to another. Incomplete dominance occurs when neither allele dominates over the other. The resulting phenotype of heterozygotes is an intermediate of the two extremes. Incomplete dominant genes control snapdragon flower color. Red flower plants crossed with white flower plants produce offspring with pink flowers. One human trait that is thought to be inherited in this fashion is hair structure. Curly hair and straight hair are due to homozygous genotypes and wavy hair is produced by the heterozygous genotype. An incompletely dominant gene also controls the plumage of chickens. Black plumage and white plumage are due to homozygous genotypes and a blue-grey color results from a heterozygous genotype. Using Punnett squares and variations of the letter “B”, answer questions 1-3 and use variations of the letter “R” to answer questions 4-5. What type of offspring and in what ratio would you expect from a cross between a black…arrow_forwardTwo genes can interact in which several ways to determine a single trait?arrow_forward
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