Exam 1: Mendels Principles of Heredity

Which of the following ratios show codominance?

The phenotypic ratio 1:2:1 may indicate

Mendel's law of segregation states that two alleles for each trait unite in a specific,predictable manner during gamete formation.

A testcross is a cross between two heterozygotes.

Mutations are the source of new alleles.

The progeny of the F₁ generation is also known as the second filial generation

Calculate the probability of the production of a homozygous recessive genotype for the following cross: AaBbccddEeFf × AaBbCcddEeFf

A mutant allele has a rare occurrence in a population.

What phenotypes and genotypes would you expect from the following cross of blood-related genotypes? I^B i rh⁺ rh⁺ × I^Ai rh⁺ rh

In a monohybrid cross AA × aa,what proportion of homozygotes is expected among the F₂ offspring?

The flower colours white,pink,and red indicate codominant inheritance.

A zygote is a fertilized egg.

An allele that expresses its phenotype even when heterozygous with a recessive allele is termed

A rare recessive trait in a pedigree is indicated by which pattern of inheritance?

Which of the following was not involved in the rediscovery of Mendel's work?

Stem colour of tomato plants is known to be under the genetic control of at least one pair of alleles such that A_ results in the production of anthocyanin pigment (purple stem).The recessive genotype aa lacks this pigment and hence is green.The production of two locules (seed chambers)in the tomato fruit is controlled by the dominant allele M,and multiple locules is determined by mm.Determine the genotypic and phenotypic ratios of the F₂ offspring beginning with a parental cross between an inbred tomato plant that has a purple stem and fruit with two locules,and a tomato plant that has a green stem and fruit with multiple locules.Assume independent assortment.

The phenomenon of a single gene determining a number of distinct and seemingly unrelated characteristics is known as pleiotropy.

You are a judge in a civil trial where a young man is attempting to prove that he is the illegitimate child of a very wealthy man who has recently died.He wishes to be included in the distribution of the wealth.After considering all the testimony about how this person was conceived,the key evidence seems to come down to two main facts.The wealthy man and the mother of the young man are both deaf but the young man is not.Therefore the lawyer of the family suggests that the wealthy man is not the father.The mother,wealthy man,and young man all have O,MM,and Rh Blood Type at the phenotypic level but a genotyping screen indicates that the wealthy man is actually I^AI^A hh blood type.How do you interpret the evidence presented and how does it influence your decision in this case?

An interaction between non-allelic genes that results in the masking of expression of a phenotype is

Short hair in rabbits is produced by a dominant allele (l⁺)and long hair by its recessive allele (l).Black hair results from the action of a dominant allele (b⁺)and brown hair from its recessive allele (b).Determine the genotypic and the corresponding phenotypic ratios of the F₁ offspring,beginning with a parental cross of a rabbit with brown,short hair to a rabbit with long,black hair.Assume that the parent with short hair is homozygous for that allele,and that the parent with black hair is homozygous for that allele.Assume independent assortment.