A true breeding red striped tree frog is crossed with a true breeding plain green frog. All progeny have red stripes. This is because:
1. | Stripes are dominant to plain green coloration. |
2. | Striped frogs are camouflaged better. |
3. | Plain green frogs are easily predated upon. |
4. | Striped frogs are more common. |
A gene is said to be dominant if:
1. | It expresses its effect only in the homozygous stage |
2. | It expresses only in heterozygous condition |
3. | It expresses both in homozygous and heterozygous conditions |
4. | It is never expressed in any condition |
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Black coat colour is a dominant trait while the albino trait is recessive in mice. You want to raise only black-coat mice as they appear more graceful to you. You crossed black mice with albino mice thinking that all progeny will be black based on dominance. You felt disappointed when your cross yielded only three black-coat mice out of seven. This is because you incorrectly:
1. | assumed that black alleles were more common than white. |
2. | assumed that white alleles were more common than black. |
3. | assumed that my black mouse was true-breeding. |
4. | assumed that my white mouse was true-breeding. |
A cross that involves the breeding of a phenotypically dominant individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes is termed as a:
1. | Monohybrid cross | 2. | Test cross |
3. | Back cross | 4. | Reciprocal cross |
I: | In a test cross, the allele the individual in question [one that expresses the dominant phenotype] passes on, determines the phenotype of the offspring. |
II: | The homozygous recessive individual can only pass on recessive alleles. |
1. | Both I and II are correct and II explains I |
2. | Both I and II are correct but II does not explain I |
3. | I is correct but II is incorrect |
4. | I is incorrect but II is correct |