3 and 4 Biology to6 L A woman with stahed alsbes (oe) i thiehae b(E nsses with a

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3 and 4

Biology to6 L A woman with stahed alsbes (oe) i thiehae b(E nsses with a man with boe e What isthe genuitypie ratis of the crossin be 2EEE Eee d. What is the phenotypie ratio of the ros in b 31 umotiocheol o affoch . What are all possible genotypes foe unattached and attached carlobes? Specify which gevotypes 2. A homorypous recE nonver (RR) creoes ?7th a homory Rous yellow flower (rt). All of the offspring. are orange. a, Is this complete dominance, incomplete, or eodon inance, b. What is the genotype of any orange flower? c Draw a Punnett Square crussing a yellow fower with an orange ftlower What is the genotypic ratio of the cross in e?Rn5pn 1:1 d. e. What is the phenotypic ratio of the crossin e? dnge:Sellowl: 3. A homozygous red umbrella-nosed floogle is mated with a homozygous green umbrella-nosed foogle. All of the baby floogles have red and green striped noses. What is the dominance pattern? is imtomlete sounimane 4. A homozygous red eared zigrat is mated with a homozygous bluet eared zigrat. All of the offspring have purple ears. What is the dominance pattern? lo olomimante whene botn allelr, phoud tha

Explanation / Answer

Ans. #3. Since the phenotype of the progeny (heterozygote) exhibits the phenotype of both the parents, red stripes – green stripes- it’s case of co-dominance.

Co-dominance: The heterozygote expresses both the alleles simultaneously and its phenotype co-displays the traits controlled by the constituent genotype.

The phenotypes of heterozygote exhibits some part of dominance allele and some part of recessive allele. So, both the dominant and recessive phenotypes are simultaneously visible in the heterozygous individual. It is unlike incomplete dominance where the heterozygote displays uniform intermediate phenotype.

#4. Since the phenotype of the progeny (heterozygote) exhibits a uniform intermediate phenotype - it’s case of incomplete dominance.

Incomplete/ Partial Dominance: The phenotype of the heterozygote is intermediate of the homozygous dominant and homozygous recessive phenotypes. The intermediate phenotypes is a uniform/homogenous mixture of two phenotypes, thus the dominant and recessive phenotypes are not distinguishable.

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