PKA BIOKEEN WEEK9

1. Mendel's First Law is

2. Mendel's Second Law is

3. Questions no.1-5 are related.

4. In cats, short fur is controlled by dominant allele (Q) while long fur is controlled by recessive allele (q). Brown fur is controlled by allele (R) and white fur by allele (r).These loci are unlinked. A cross is made between a female cat and a male cat.

The possible gametes produced by the male cat are qR and qr.

1. 1. State its genotype.

• QQRR

• qqRR

• QQRr

• qqRr

In cats, short fur is controlled by dominant allele (Q) while long fur is controlled by recessive allele (q). Brown fur is controlled by allele (R) and white fur by allele (r).These loci are unlinked. A cross is made between a female cat and a male cat.

The possible gametes produced by the male cat are qR and qr.

2. 2. State its phenotype.

• Long and white fur

• Short and white fur

• Long and brown fur

• Short and brown fur

3. 3. The possible gametes produced by the female cat are QR, Qr, qR and qr. State its genotype.

• QQRR

• QqRr

• QqRR

• QQRr

In cats, short fur is controlled by dominant allele (Q) while long fur is controlled by recessive allele (q). Brown fur is controlled by allele (R) and white fur by allele (r).These loci are unlinked. A cross is made between a female cat and a male cat.

4. 4. What is the percentage of the progenies from the cross between qqRR and QqRr would have brown fur?

• 75%

• 50%

• 25%

• 0%

In cats, short fur is controlled by dominant allele (Q) while long fur is controlled by recessive allele (q). Brown fur is controlled by allele (R) and white fur by allele (r).These loci are unlinked. A cross is made between a female cat and a male cat.

5. 5. What is the percentage of the progenies from the cross between qqRR and QqRr would have long and white fur?

• 62.5%

• 37.5%

• 12.5%

• 0%