cat

7.

All of these options are possible fur colors in females. Since females have 2 X chromosomes, they can have any combination of black and orange alleles.

6.

All of these options are possible fur colors in males except black, orange, and white. This phenotype requires 2 X chromosomes, one with the black allele and one with the orange allele.

1.

An organism's phenotype is only made up of genes and alleles.​​​​​​​

Examine the graph

B: The same number of cells from Calix and the control cat were added to the cytometer D: Calix's cells have more DNA in them compared to the cells of the control cat

Which parental X chromosome has matches for Calix's DNA?

Both Parents

background

Calico cats are usually female and male cats only have this fur color when there is a genetic disorder

5.

Fertilization requires two haploid cells.

Meiosis 1 or 2

For Calix to have 2 X chromosomes, but still be male, he must have received both an X and a Y chromosome from his father. Only a nondisjunction in meiosis I leads to a gamete with both X and Y chromosome.

Calix

High

Chromosomal Arrangement

Increase

Nondisjunction

Increase

Point Mutation

No Change

Father

Normal

Mother

Normal

Which of these shows a normal male (XY) cat's DNA being added?

Normal male cats have one X chromosome (XY), which is always inherited from the mother. Slide #2 is the only slide that shows gene matches from only the mother's X chromosomes.s

expirement 3

Only nondisjunction could cause Calix to have an XXY karyotype. Calix inherited a black fur color allele from his father and an orange fur color allele from his mother. ​​​​​When combined with white spots, the orange and black alleles gave Calix calico fur coloring.

2.

The DNA of the diploid germ cell must be doubled. (2x)

Lower than female

The male cat is XY, while the female cat is XX, and the Y chromosome is smaller than the X.

4.

The random line up of the tetrads makes the set of chromosomes that end up at each side random. Since the chromosomes can be pulled in 2 directions and cats have 19 chromosome pairs, Anaphase can produce over 520,000 chromosome combinations! This is very important for genetic variation.

expirement 1

This change in the DNA could cause the cell's fur color allele to change from orange to black but there was no DNA change in Calix.

expirment 2

This mutation needs two X chromosomes. Only the mother has two X chromosomes. The father is male, so he only had one X chromosome but the calico cat has a genotype of XXY.

Control Cat

black male

Nondisjunction

same & none

Nondisjunction 2

same, none, same, none

Choose the mutation that you think has caused Calix's calico fur coloring. Form a hypothesis to explain your reasoning. You will be able to revise your hypothesis as you collect more data.

(Non Disjunction)

8.

(mother) This mutation needs two X chromosomes. Only the mother has two X chromosomes (XX). The father is male, so he only had one X chromosome (XY).

3.

(two) so the germ cell must divide twice to make four gametes.