Inheritance (DP IB Biology: HL)

If two genes are said to be linked, what is meant by the term 'linked'?

Fruit flies (Drosophila melanogaster) have been used in genetic cross experiments since the early 1900s. Which of the following features of fruit flies is the least good reason for choosing them for conducting genetic cross experiments?

Fruit flies (Drosophila melanogaster) exhibit characteristics governed by the following pairs of alleles.

M = brown body, m = black body

R = red eyes, r = white eyes

These pairs of alleles can be assumed to be unlinked.

If two double-heterozygous flies are crossed and produce 160 offspring, what is the likely number of offspring with red eyes and a black body?

Which discovery was first made by Bateson and Punnett in the early 20^th century?

Events in meiosis play an important role in determining the inheritance of alleles. Which row of the table states the correct words to name the processes being described?

Two linked genes are denoted by the dominant alleles G and H. Their recessive counterparts are g and h respectively.

Which way of writing the allele combinations on their chromosomes best displays the linkage between the two genes?

The inheritance pattern of two separate genes was investigated in a double-heterozygous cross in watercress plants. A chi-squared test of phenotypic ratios of the two separate genes results in a χ² value of 3.5.

At a 5% probability level, the critical value of chi-squared is 7.8 for an experiment of this nature.

Which row of the table best describes a conclusion that can be drawn from this data?

Which row(s) below give(s) correct statements about continuous variation?

Over time, many dihybrid cross experiments of autosomally-linked genes in sweet pea plants (Lathyrus odoratus) have been carried out by reputed scientists.

Which of the following best explains the presence of some non-parental phenotypes in the offspring of such crosses?

Long hair in a species of rabbit is caused by the presence of the allele H^L. These rabbits have either very long hair or moderately long hair. The 'wild-type' short-haired rabbit possesses the allele H^S. The diagram below shows the results of two crosses involving one female and two male rabbits.

Which row of the table below shows the phenotypes of the rabbits with the genotypes H^LH^L and H^LH^S?

In rabbits, brown coat is dominant to black coat and long ears are dominant to short ears. Two rabbits are heterozygous for both characteristics.

What is the probability that their first offspring will have black coats and short ears?

Which of the following processes results in the production of recombinants?

I. Crossing over of bivalents
II. Independent assortment during meiosis I
III. Independent assortment during meiosis II 
IV. Mutation

The inheritance pattern of two separate genes was investigated in a double-heterozygous cross in domestic cats (Felis catus). A chi-squared test of phenotypic ratios of the two separate genes results in a χ² value of 7.96.

The table below shows the critical values of the chi squared distribution. 

Which row of the table best describes a conclusion that can be drawn from this data?

In a breeding experiment, a tall, round seeded (homozygous dominant) pea plant was crossed with a short, wrinkled seeded (homozygous recessive) pea plant. The F₁ dihybrid plants were then used in a test cross.

If the genes are always linked and no crossing over occurs, what would be the predicted ratio in the F₂ generation?

In a variety of roses, P is the allele for pink petal colour and D is the allele for double flower.

Which cross will give a 1:1:1:1 ratio of phenotypes in the offspring?