AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A homozygous dominant mom mated with a father that is homozygous recessive. Create a Punnett square to determine the possible genotypes?
 A Ff only B FF & ff C Ff & ff D ff only
Explanation:

Detailed explanation-1: -For example, if one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow’s peak.

Detailed explanation-2: -In a test cross, the dominant-expressing organism is crossed with an organism that is homozygous recessive for the same characteristic. If the dominant-expressing organism is a homozygote, then all F1 offspring will be heterozygotes expressing the dominant trait (Figure 8.8).

Detailed explanation-3: -A monohybrid cross between a parent that is homozygous dominant and a parent that is homozygous recessive for a particular trait produces offspring that are all heterozygous for that trait. These individuals have two different alleles for that trait.

Detailed explanation-4: -To calculate the probability, count the number of homozygous recessive offspring and multiply to 0.25 (the probability of each allele combination in gametes). With this, the probability of obtaining a homozygous recessive offspring is 0.25.

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