Unit 5 check

Unit 5 check: Heredity

10 questions from 5 lessons in Unit 5. Answer each one, and if you miss, follow the link back to where it is taught, then try again. Your score counts first tries.

Question 1 · from 5.1 · Fill the statement

Complete the description of how chromosomes pass from one generation to the next.

In a sexually reproducing organism, meiosis forms gametes. When two gametes fuse at , the chromosome number of the parents is restored.

Question 2 · from 5.2 · Sort it

One parent's chromosome carries alleles A and B, and its homolog carries a and b. One crossover happens between the two genes. Each card is a chromatid after meiosis. Tap a card, then the kind of chromatid it is.

Same as a parent's chromosome

A new combination

Question 3 · from 5.3 · Multiple choice

Genes A and B are on different chromosomes. A plant with genotype AaBb inherited A and B from its mother, and a and b from its father. What fraction of its gametes carry A and b?

Question 4 · from 5.4 · Match

Match each pattern seen in families or crosses to the kind of inheritance it points to.

Setup for question 5

A new species. Researchers raise larvae of two genotypes of an insect at 20 °C and at 30 °C and record the percentage of adults with dark wings. These numbers are a teaching example.

Genotype A: 90% dark at 20 °C, 10% dark at 30 °C
Genotype B: 5% dark at 20 °C, 5% dark at 30 °C

Question 5 · from 5.5 · Calculate

For genotype A, the percentage of dark-winged adults at 20 °C is how many times the percentage at 30 °C?

Your answer

Question 6 · from 5.1 · Put it in order

Put the events of meiosis I in the order they happen.

Question 7 · from 5.2 · Multiple choice

In a species with 2n = 12, the homologous chromosomes of one pair fail to separate in meiosis I, and meiosis II goes normally. Which describes the four gametes?

Question 8 · from 5.3 · Match

Purple flowers are dominant to white in a plant species. Match each cross or result to the conclusion or prediction it best supports.

Setup for question 9

A new cross. In another fly species, males are XY and females are XX, and red eyes are dominant to white eyes. A white-eyed female is crossed with a red-eyed male. Of 400 offspring, all 200 daughters have red eyes and all 200 sons have white eyes. These numbers are a teaching example.

Question 9 · from 5.4 · Calculate

Suppose instead the eye color gene were on an autosome and the red-eyed male were heterozygous, while the white-eyed female is homozygous recessive. How many of the 200 sons would you expect to have white eyes?

Your answer

Setup for question 10

A new species. Researchers raise larvae of two genotypes of an insect at 20 °C and at 30 °C and record the percentage of adults with dark wings. These numbers are a teaching example.

Genotype A: 90% dark at 20 °C, 10% dark at 30 °C
Genotype B: 5% dark at 20 °C, 5% dark at 30 °C

Question 10 · from 5.5 · Decide and justify

Does genotype B show phenotypic plasticity for wing color between these two temperatures?

Which evidence supports your decision?

0 of 10 answered.